B1243

DOOR LOCK: POWER DOOR LOCK CONTROL SYSTEM: B1243: GSW Terminal Circuit Malfunction

DTC B1243 - GSW Terminal Circuit Malfunction

DESCRIPTION

If the collision door lock release function does not operate normally, or an open or short in the GSW input circuit of the main body ECU is detected, DTC B1243 will be output.
HINT: If DTC B1243 is output, the speed-sensitive automatic door lock function, shift-linked automatic door unlock function, and collision door lock release function will be prohibited.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTC.

Result





B -- USE SIMULATION METHOD TO CHECK
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - CENTER AIRBAG SENSOR)
(a) Disconnect the negative (-) terminal cable from the battery.
CAUTION:
Wait at least 90 seconds after disconnecting the negative (-) terminal cable from the battery to prevent airbag and seat belt pretensioner activation.
NOTICE:
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
- After the power switch is turned OFF, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the power switch OFF, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.




(b) Disconnect the DA ECU connector.
(c) Disconnect the L73 sensor connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CHECK MAIN BODY ECU (GSW VOLTAGE)
(a) Disconnect the negative (-) terminal cable from the battery.
CAUTION:
Wait at least 90 seconds after disconnecting the negative (-) terminal cable from the battery to prevent airbag and seat belt pretensioner activation.
NOTICE:
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
- After the power switch is turned OFF, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the power switch OFF, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.




(b) Reconnect the DA ECU connector.
(c) Connect the negative (-) terminal cable to the battery.
(d) Turn the power switch ON (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE MAIN BODY ECU
OK -- Continue to next step.
4. REPLACE CENTER AIRBAG SENSOR
(a) Disconnect the negative (-) terminal cable from the battery.
CAUTION:
Wait at least 90 seconds after disconnecting the negative (-) terminal cable from the battery to prevent airbag and seat belt pretensioner activation.
NOTICE:
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
- After the power switch is turned OFF, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the power switch OFF, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
(b) Replace the center airbag sensor Removal.
NEXT -- Continue to next step.
5. CHECK DTC OUTPUT
(a) Recheck for DTC Reading and Clearing Diagnostic Trouble Codes.

Result





B -- END
A -- REPLACE MAIN BODY ECU