Driver Side Switch Module LIN Communication Malfunction

MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM: Driver Side Switch Module LIN Communication Malfunction
- Driver Side Switch Module LIN Communication Malfunction

DESCRIPTION

The outer mirror switch monitors the LIN communication bus between the components related to the switches on the driver side seat.

HINT
DTC U1127, U1128 and U1129 are output simultaneously when: 1) there is an open or short in the LIN communication bus between the switches on the driver side seat, and 2) their LIN communication bus stops.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When using the Techstream with the engine switch off to troubleshoot:

Connect the Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

PROCEDURE

1. CLEAR DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

2. CHECK FOR DTC

(a) Recheck for DTC Reading and Clearing Diagnostic Trouble Codes.

Result





HINT
*: w/ Climate Control Seat System

B -- Go to DTC CHART LIN Communication System

C -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (OUTER MIRROR SWITCH - NO. 1 CONSOLE SWITCH)

(a) Disconnect the L6 and L75 switch connectors.





(b) Measure the resistance and voltage according to the value(s) in the table below.

Standard resistance:





Standard voltage:





NG -- CLEAR DTC

OK -- REPLACE OUTER MIRROR SWITCH Removal

4. CLEAR DTC

(a) Reconnect the L6 switch connector.

(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

5. CHECK FOR DTC

(a) Disconnect the L75 switch connector.

(b) Recheck for DTC Reading and Clearing Diagnostic Trouble Codes.

Result





HINT
*: w/ Climate Control Seat System

B -- REPLACE NO. 1 CONSOLE SWITCH Disassembly

C -- REPLACE NO. 1 CONSOLE SWITCH Disassembly
A -- Continue to next step.

6. CLEAR DTC

(a) Reconnect the L75 switch connector.

(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

7. CHECK FOR DTC

(a) Disconnect the e4 ECU connector.

(b) Recheck for DTC Reading and Clearing Diagnostic Trouble Codes.

Result





HINT
*: w/ Climate Control Seat System

B -- REPLACE FRONT SEAT CLIMATE CONTROL ECU RH Disassembly
A -- Continue to next step.

8. CLEAR DTC

(a) Reconnect the e4 ECU connector.

(b) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

9. CHECK FOR DTC

(a) Disconnect the e34 ECU connector.

(b) Recheck for DTC Reading and Clearing Diagnostic Trouble Codes.

Result





HINT
*: w/ Climate Control Seat System

B -- REPLACE FRONT SEAT CLIMATE CONTROL ECU LH Disassembly

A -- REPAIR OR REPLACE HARNESS OR CONNECTOR