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05-1989
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
05BE1-04
PRE-CHECK
1. DYNAMIC LASER CRUISE CONTROL SYSTEM DESCRIPTION
(a) This system maintains the vehicle running at the fixed speed that the driver has set, as long as there
are no vehicles ahead in the same lane. Then, the system maintains the vehicle distance that has been
set by the driver.
If the system detects a front vehicle moving slower speed than one's own vehicle while the driver is
driving at a fixed speed, it closes the throttle valve to decelerate. If additional deceleration is necessary,
it shifts the gears down to decelerate. If further deceleration is required, the system controls the brake
actuator in order to apply the brakes. Thereafter, if there are no front vehicles within the set vehicle-to-
vehicle distance because either the vehicle in front or the driver has changed lanes, the system accel-
erates slowly to reach the set vehicle speed and resumes driving at the fixed speed.
(b) (fixed speed) cruise control mode that effects control only to maintain a fixed cruising speed. The ve-
hicle-to-vehicle distance control mode that effects cruising at a fixed speed function, deceleration
cruising function, follow-up cruising function, and acceleration cruising function. These two modes can
be switched by operating the cruise control main switch.
(c) A steering pad switch (Distance control switch) for setting the distance to the front vehicle is provided
on the steering wheel pad.
With this switch, the vehicle distance can be set in the following three stages: LONG, MIDDLE, and
SHORT.
2. LASER BEAM AXIS ADJUSTMENT
Use the hand-held tester to adjust to the optical axis (see page 82-3 for the optical axis adjusting operation).
HINT:
While adjusting the optical axis of the laser radar sensor, the CRUISE main indicator light illuminates and
FC is displayed on the multi-information display.
3. DIAGNOSIS FUNCTION
(a) The diagnosis function makes the master warning light
Master Warning Light and the multi- information display to come on, and
CRUISE main indicator light blinks as shown in the il-
Cruise Main lustration, when a malfunction occurs in the dynamic laser
Indicator Light cruise control system, and store the diagnosed result in
the ECM.
NOTICE:
S The master warning light goes off if the system re-
turns to normal condition.
Multi-information S Since the stored data in the ECM is erased by discon-
Display necting the EFI fuse and the battery terminal, do not
disconnect them until finishing the inspection.
I34893 I34905
CRUISE Main Indicator Light
1.5 sec. 0.5 sec.
ON
OFF
BE4034
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2172
05-1990
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
4. DIAGNOSING SYSTEM
(a) Description
The ECM controls the function of cruise control and dy-
namic laser cruise control on a vehicle. Data on the cruise
control system, dynamic laser cruise control system and
the DTCs can be read from DLC3 on the vehicle. If the
CRUISE main indicator does not come on after the DTC
check, there is a malfunction on the cruise control and dy-
namic laser cruise control system.
Use the hand-held tester or SST check wire to check and
solve the problem.
SST 09843-18040
(b) Check the DLC3.
The vehicle's ECM uses ISO 9141-2 for communication.
The terminal arrangement of DLC3 complies with SAE
1 2 3 4 5 6 7 8 J1962 and matches the ISO 9141-2 format.
9 10 11 12 13 14 15 16
DLC3
F40034
Terminal No. Connection/Specified Condition Condition
4 Chassis Ground Body Ground/1 or less Always
7 Bus Line/Pulse Generation During Communication
16 Battery Positive Body Ground/9 to 14 V Always
HINT:
If the display shows "UNABLE TO CONNECT TO VEHICLE"
when the hand-held tester is connected to the DLC3 and the
ignition switch is ON, there is a problem on either the vehicle or
the tool.
S If communication is normal when the tool is connected to
another vehicle, check DLC3 on the original vehicle.
S If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself. Consult with the Service Department listed in
the tool's instruction manual.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2173
05-1991
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
CRUISE Main Indicator Light (c) Check the indicator.
(1) Turn the ignition switch ON.
(2) Check that the CRUISE main indicator light and
READY indicator light comes on when the cruise
control main switch is turned on. Then, the indicator
READY light goes off when the main switch is turned off.
Indicator HINT:
Light If the indicator check result shows problem, proceed to trouble-
I34890 shooting (See page 05-1525 ) for the combination meter
section.
(d) Check the DTCs.
CRUISE Main Indicator Light
HINT:
If a malfunction occurs in the vehicle speed sensors or the stop
1.5 sec. 0.5 sec.
lamp switch, etc. during cruise control driving, the ECU actuates
AUTO CANCEL of the cruise control and blinks CRUISE main
ON
indicator light. This indicator light inform malfunction to the driv-
er. At the same time, the malfunction date is stored as a diag-
OFF nostic trouble code.
BE4034
DLC3
(e) Check the output of the DTCs using diagnosis check wire.
CG (1) Turn the ignition switch ON.
(2) Using SST check wire, connect terminals TC and
1 2 3 4 5 6 7 8 CG of DLC3.
9 10 11 12 13 14 15 16 SST 09843-18040
(3) Read the DTC on the CRUISE main indicator light.
TC
F40034
Normal Code HINT:
0.25 sec. If the DTCs are not indicated, inspect the cruise main indicator
0.25 sec. light circuit (See page 05-2043 ) and the diagnosis circuit (See
page 05-2047 ).
ON For example, the blinking patterns of normal code and code 52
are shown in the illustration.
OFF
Malfunction code 52
0.5 sec. 0.5 sec.
2.5 sec.
1.5 sec.
ON
OFF
Code 52 I03610
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2174
05-1992
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
5. AUTO CANCEL FUNCTION (FAIL-SAFE FUNCTION)
HINT:
Master Warning Light If a system malfunction occurs, the applicable DTCs (Diagnos-
tic Trouble Codes) will appear on the multi-information display.
Cruise Main (a) The cruise main indicator keeps blinking until turning the
Indicator Light main switch off, the master warning light comes on with
the warning sound "Pop", and the display shows "E3".
The cruise control operation is suspended until turning
the main switch to ON again. The auto cancel function de-
letes the stored vehicle speed and cancels the cruise con-
Multi-information trol operation in the following conditions.
Display (1) When the vehicle speed signal malfunctions.
(2) When the electronic throttle parts malfunction.
I34893 I34905 (3) When the stop lamp switch is open or short circuit.
(4) When the laser radar sensor malfunctions. (*1)
(5) When the light axis of the laser radar sensor is off
the position. (*1)
*1: Only in the Vehicle- to- vehicle Distance Control
Mode.
(b) The cruise main indicator blinks, the master warning light
comes on with the warning sound "Pop", and the display
Master Warning Light
shows "E2". The cruise control operation is suspended
until the canceling condition is resolved (in the Vehicle-to
Cruise Main vehicle Distance Control Mode only). The auto cancel
Indicator Light function cancels the cruise control operation in the follow-
ing conditions.
(1) When the wipers (Hi, Lo) operate (including the
auto wiper).
(2) When the pattern select switch is in the "SNOW"
Multi-information mode.
Display (3) When the laser radar sensor receives strong light,
such as sunlight, from the front side.
I34894 I34906 (4) When the Vehicle-to-vehicle distance measure-
ment is extremely unstable because of a bad
weather.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2175
05-1993
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
(c) The auto cancel function cancels the cruise control op-
eration in the following conditions. At this time, the cruise
Master Warning Light main indicator blinks, the master warning light comes on
with the warning sound "Pop" and the display shows "E1".
Cruise Main The cruise control operation is suspended until the can-
Indicator Light celing condition is resolved (in the Vehicle-to vehicle Dis-
tance Control Mode only).
(1) When the laser radar sensor has dirt on it.
HINT:
While the dynamic laser cruise control is operated, the ECM
Multi-information outputs a malfunction code when it detects dirt for 0.15 sec. or
Display more.
I34895 I34907
6. USING HAND-HELD TESTER
(a) Hook up the hand-held tester to the DLC3.
(b) Monitor the ECU data by following the prompts on the tes-
ter screen.
HINT:
The hand-held tester has the "Snapshot" function which re-
DLC3
cords the monitored data.
Hand-held Refer to the hand-held tester operator's manual for further de-
Tester F44425 tails.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2176
05-1994
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
7. DATA LIST
HINT:
From the DATA LIST displayed by the hand-held tester, you can read the value of the switch, sensor, actua-
tor and so on without parts removal. Reading the DATA LIST as the first step of troubleshooting is one of
the way to shorten labor time.
(a) Connect the Hand-held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) According to the display on the tester, read the "DATA LIST".
ECM:
Measurement Item /
Item Normal Condition Diagnostic Note
Display (Range)
Accel request signal /
ACCEL REQUEST min.: -2621.44 k/h/s, 0.8 k/h/s: No vehicle in front -
max.: 2621.36 k/h/s
Laser radar sensor /
VEHICLE DISTANCE min.: 0 m (0 ft), Distance to the vehicle in front -
max.: 255 m (836.65 ft)
Steering angle sensor /
Approx. 0 deg: When driving
STEERING ANGLE min.: -36864 deg, -
straight
max.: 36862.88 deg
Alarm request signal / REQUEST: When beeping
ALARM RQST -
NOT REQ, REQUEST NOT REQ: When not beeping
Shift down request signal /
SHIFT DOWN RQST NOT REQ: Always -
NOT REQ, REQUEST
REQUEST: When driving in 4 th
O/D cut request / gear on an uphill slope
O/D CUT RQST -
NOT REQ, REQUEST NOT REQ: In the situation other
than mentioned above
YES: Vehicle to vehicle distance
L/C OPTION FLAG Laser cruise option flag / NO, YES -
mode
Car distance time setting condition The vehicle select by distance
DISTANCE TIME -
/SHRT, MID, LONG, NO control switch
Yaw rate date /
Approx. 0 deg: When driving
YAW RATE min.: -7999.98 deg/s, -
straight
max.: 7999.74 deg/s
Main SW signal (Main CPU) / ON ON : Main SW ON (Pushed in)
MAIN SW (MAIN) "3"
or OFF OFF Main SW OFF (Pushed out)
Main SW signal (Sub CPU) / ON ON : Main SW ON (Pushed in)
MAIN SW (SUB) "3"
or OFF OFF Main SW OFF (Pushed out)
Cruise control system stand by ON OFF : Change ON/OFF
CCS READY M "1"
condition (Main CPU) / ON or OFF each time Main SW is Pushed in.
Cruise control system stand by ON OFF : Change ON/OFF
CCS READY S "1"
condition (Sub CPU) / ON or OFF each time Main SW is Pushed in.
Cruise indicator signal (Main CPU) ON : "CCS READY" ON
CCS INDICATOR M "2"
/ ON or OFF OFF : "CCS READY" OFF
Cruise indicator signal (Sub CPU) ON : "CCS READY" ON
CCS INDICATOR S "2"
/ ON or OFF OFF : "CCS READY" OFF
Cruise control system active ON : Cruise control activated
CRUISE CONTROL -
condition / ON or OFF OFF : Cruise control inactivated
PNP SW signal (D position) / ON ON : Shift D position
SHIFT D POS -
or OFF OFF : Except shift D position
Stop light SW signal (Sub CPU) / ON : Brake pedal depressed
STP LIGHT SW1-S -
ON or OFF OFF : Brake pedal released
Stop light SW signal (Sub CPU) / ON : Brake pedal depressed
STP LIGHT SW2-S -
ON or OFF OFF : Brake pedal released
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2177
05-1995
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
Measurement Item /
Item Normal Condition Diagnostic Note
Display (Range)
Stop light SW signal (Main CPU) / ON : Brake pedal depressed
STP LIGHT SW2-M -
ON or OFF OFF : Brake pedal released
ON : +/RES SW ON
RES/ACC SW +/RES SW signal / ON or OFF -
OFF : +/RES OFF
ON : -/SET SW ON
SET/COAST SW -/SET SW signal / ON or OFF -
OFF : -/SET SW OFF
ON : CANCEL SW ON
CANCEL SW CANCEL SW signal / ON or OFF -
OFF : CANCEL SW OFF
Vehicle speed sensor/
VEHICLE SPD min.: 0 km/h (0 mph), Actual vehicle speed -
max.: 255 km/h (158 mph)
Cruise control memorized speed /
Memorized speed : Cruise control
MEMORY SPD min.: 0 km/h (0 mph), -
activated
max.: 255 km/h (158 mph)
Required throttle opening angle
Required throttle opening angle /
THROTTLE (0_ - 84_) : Cruise control acti- -
min.: 0 deg, max.: 125 deg
vated
HINT:
"3" is OK, but "1" is NG ECM failure
"1" is OK, but "2" is NG DTC output or ECM failure
"3" is OK, but cruise indicator does not turn on Indicator or W/H or ECM failure
8. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the meth-
od to shorten the labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) According to the display on tester, perform the "ACTIVE TEST".
HINT:
IG must be turned ON to proceed Active Test using a hand-held tester.
SKID CONTROL ECU:
Item Vehicle Condition / Test Details Diagnostic Note
VSC / BR WARN BUZ Turns VSC / BRAKE warning buzzer ON / OFF Buzzer can be heard
STP LIGHT RELAY Turns BRK relay ON / OFF -
9. DTC CLEAR
(a) Following actions will erase the DTCs and the freeze frame data.
(1) Hand-held Tester:
Operating the hand-held tester to erase the codes.
(2) Except hand-held Tester:
Disconnecting the battery terminals or EFI fuse.
(b) After completing repairs, stored DTCs in the memory can be cleared by removing the EFI fuse for 1
minutes or more with the ignition switch off.
(c) Check that the normal code is displayed after connecting the fuse.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2178
05-1996
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
10. PROBLEM SYMPTOM CONFIRMATION
(ROAD TEST)
(a) Inspect the SET switch.
(1) Push the main switch to ON.
(1) (2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(3) Press the control switch towards the - SET.
(4) After releasing the switch, check that the vehicle
(3)
I35494 cruises at the desired speed.
(b) Inspect the + (ACCEL) switch.
(3) (1) Push the main switch to ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(1) (3) Check that the vehicle speed increase while the
control switch is pressed towards + RES, and that
the vehicle cruises at the set speed when the switch
is released.
I35494 (4) Momentarily press the control switch towards the +
RES and then immediately release it. Check that
the vehicle speed increases about 1.6 km/h (1.0
mph) (Tap-up function).
HINT:
Tap-up/T ap-down function can be used only in the fixed-
speed Control Mode.
(c) Inspect the - (COAST) switch.
(1) Push the main switch to ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(1) (3) Check that the vehicle speed decrease while the
control switch is pressed towards to - SET, and the
vehicle cruises at the set speed when the switch is
released.
(3)
I35494 (4) Momentarily press the control switch towards to -
SET, and then immediately release it. Check that
the vehicle speed decrease about 1.6 km/h (1.0
mph) (Tap-down function).
HINT:
Tap-up/T ap-down function can be used only in the fixed-
speed Control Mode.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2179
05-1997
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
(d) Inspect the CANCEL switch.
(1) Push the main switch to ON.
(2) Drive at a desired speed (40 km/h (25 mph) or high-
er).
(1) (3) When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.
(3) S Depress the brake pedal
I35494 S Shift to except D position
S Push the main switch button to OFF
S Pull the cruise control switch to CANCEL
(e) Inspect the + (RESUME) switch.
(3) (1) Push the main switch button to ON.
(2) Drive at desired speed (40 km/h (25 mph) or high-
er).
(1) (3) When operating one of the followings, check that
the cruise control system is cancelled and that the
normal driving mode is reset.
S Depress the brake pedal
I35494 S Shift to except D position
S Pull the cruise control switch to CANCEL
(4) After pressing up the control switch towards + RES
at the driving speed of more than 40 km/h (25 mph),
check that the vehicle restores the speed prior to
the cancellation.
(5) RESUME (in the Vehicle-to-vehicle Distance Con-
trol Mode only.)
HINT:
The stored vehicle speed is retained even if the vehicle speed
becomes less than 40 km/h (25 mph) once. The previously
stored vehicle speed can be resumed by pressing the cruise
control main switch assy towards the "+ RES" when vehicle
speed returned to approx. 40 km/h (25 mph) or more.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2180
05-1998
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
11. INPUT SIGNAL CHECK (Using hand-held tester)
(a) Connect the hand-held tester to DLC3
(b) Check the cruise control main switch using the DATA LIST
function in hand-held tester (MAIN, CANCEL, -SET,
+RES, MODE).
I35494
DLC3
Hand-held
Tester
F44425
12. INSPECT MODE SWITCH
(a) Turn the ignition switch ON.
(b) After pressing on the main switch of the cruise control
main switch, press the cruise control main switch towards
the MODE position for at least 1 second without any other
control. After no indication is shown in the display, make
sure that "NORM. (set vehicle speed)" is indicated.
NOTICE:
I35494 When performing other operations (setting) after turning
the main switch on, the system cancels the constant speed
Cruise Main control mode and cannot return to the mode again.
NORM. Indicator Light
Indicator Light HINT:
If the system cannot switch to the constant speed control mode,
turn the main switch off once, and perform the same procedures
as shown above. If a malfunction is still detected in the system,
and then start the engine again and perform the above proce-
dure.
I34908
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2181
05-1999
DIAGNOSTICS - DYNAMIC LASER CRUISE CONTROL SYSTEM
13. INSPECT STEERING PAD SWITCH ASSY
(a) Turn the ignition switch ON.
Steering Pad (b) Press the main switch of the cruise control main switch.
Switch Assy
(c) Press the distance control switch of the steering pad
switch.
Distance
(d) Check that the indication of distance between vehicles,
Control
Switch
which are shown on the multi-information display of the
combination meter, changes from "LONG", "MIDDLE" to
"SHORT" in order.
Multi-information Display:
HINT:
The indication is immediately set to (LONG) after starting the
LONG engine.
MIDDLE
SHORT
E62706
I34891
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 2182
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