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DI-762
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3WC-09
Rear CLR Relay Circuit
CIRCUIT DESCRIPTION
The rear CLR relay is switched on by signals from the A/C control assembly. It supplies power to the rear
cooler blower motor.
WIRING DIAGRAM
Engine Room Compartment Right A/C Control Assembly
4 Rear Heater Relay 5 17
R-L R-L B-L B-L
IK8 8 8 IK8 A25 HRC
3 5
J/B No. 3 To
9 8 8 Blower
21 1 2
R-L 4 Motor
3C 3C
8
W
L-W
2L 2 1 1B 3 1R
R/B No. 7
Driver Side
RR CLR
J/B No. 1
7 7
1 2
W-B
2D 2 AM1 HEATER
B-G
Engine 2 1K 1 1K
Room
F8 FL Block
J/B No. 2 W-L ALT
2
AM1 B-L
I12
Ignition
Switch R-Y FL MAIN
IG1
INP
4
EA
W
Battery
I21114
2001 SIENNA (RM787U)
Author : Date : 916
DI-763
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminal HRC of A/C control assembly connector and
body ground.
PREPARATION:
ON HRC
Remove A/C control assembly with connectors still connected
(See page AC-1 16).
CHECK:
Measure voltage between terminal HRC of A/C control assem-
bly and body ground when ignition switch is ON and OFF.
OK:
(+) (-) Ignition Switch Voltage
I21002
OFF 0V
Blower ON 0V
ON
Blower OFF 10 - 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-697 ).
NG
2001 SIENNA (RM787U)
Author : Date : 917
DI-764
DIAGNOSTICS - AIR CONDITIONING SYSTEM
2 Check CLR relay.
3 4 5 PREPARATION:
Remove CLR relay from R/B No. 8.
3 4 5 CHECK:
Check continuity between each pair of terminals of CLR relay
shown below.
OK:
1 2 Tester connection Specified condition
1 2 1-4 No continuity
BE1850 BE1844 I00312
2-4 Continuity
3-5 62.5 - 90.9
PREPARATION:
Apply battery positive voltage between terminals 3 and 5.
CHECK:
Check continuity between each pair of terminal shown below.
OK:
Tester connection Specified condition
1-2 Continuity
2-4 No continuity
NG Replace CLR relay.
OK
3 Check HEATER fuse
Driver Side J/B No. 1
PREPARATION:
Remove HEATER fuse from driver side J/B No. 1.
CHECK:
Check continuity of HEATER fuse.
OK:
Continuity exists.
HEATER NG Check for short in all the harness and compo-
I03208
nents connected to the HEATER fuse (See at-
tached wiring diagram).
OK
Check and repair harness and connector be-
tween A/C control assembly and battery.
2001 SIENNA (RM787U)
Author : Date : 918
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