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05-1802
DIAGNOSTICS - WIRELESS DOOR LOCK CONTROL SYSTEM 056BE-04
DTC B1242 WIRELESS DOOR LOCK TUNER CIRCUIT
MALFUNCTION
CIRCUIT DESCRIPTION
When a RDA signal is not input to the door control receiver within 1 second after the multiplex network body
ECU outputs a PRG signal, this DTC is set.
DTC No. DTC Detection Condition Trouble Area
Within 1 second after PRG signal is output from S Wire harness
B1242 multiplex network body ECU during self-diagnostic S Door control receiver
mode, corresponding RDA signal is not input S Multiplex network body ECU
WIRING DIAGRAM
Instrument Panel J/B Assy
D4
Door Control Receiver Multiplex Network
Body ECU
11
3 GR
PRG B9 PRG
12
W-B 1 2 P-L
GND RDA B9 RDA
5 W-L To
+B
Battery
31
J20
J/C
42
W-B
IG
B69006
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1985
05-1803
DIAGNOSTICS - WIRELESS DOOR LOCK CONTROL SYSTEM
INSPECTION PROCEDURE
1 CHECK WIRE HARNESS (DOOR CONTROL RECEIVER - MULTIPLEX NETWORK
BODY ECU) (DOOR CONTROL RECEIVER OR MULTIPLEX NETWORK BODY ECU
- BODY GROUND)
Wire Harness Side (a) Disconnect the D4 receiver connector.
D4 (b) Disconnect the B9 ECU connector.
Door Control Receiver (c) Check the resistance between the wire harness side con-
nectors.
Standard:
Terminal No. Specified Condition
D4-2 (RDA) - RDA (B9-12) Below 1
D4-3 (PRG) - PRG (B9-11) Below 1
B9
(d) Check the voltage and resistance between the D4 receiv-
Multiplex Network Body ECU
er connector or B9 ECU connector and the body ground.
Standard:
Terminal No. Specified Condition
D4-5 (+B) - Body ground 10 to 14 V
D4-1 (GND) - Body ground Below 1
D4-2 (RDA) or B9-12 (RDA) -
10 k or higher
Body ground
D4-3 (PRG) or B9-11 (PRG) -
10 k or higher
Body ground
B68693
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
2 REPLACE DOOR CONTROL RECEIVER WITH NORMAL ONE
(a) Check that the DTC is not output.
OK REPLACE DOOR CONTROL RECEIVER
NG
REPLACE MULTIPLEX NETWORK BODY ECU
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1986
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