U1131

MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM: U1131: Lost Communication with Rear Climate Control Seat ECU LH
U1131 - Lost Communication with Rear Climate Control Seat ECU LH

DESCRIPTION

This DTC is output when LIN communication between the rear seat climate control ECU LH and rear power seat module switch stops for 10 seconds or more.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When using the Techstream with the power 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 tester and vehicle begins.

HINT
When DTC U0211, U0246, U1130 and U1131 are output simultaneously, perform troubleshooting for "Rear Side Switch Module LIN Communication Malfunction" first Rear Side Switch Module LIN Communication Malfunction.

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





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

3. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT SWITCH - SEAT CLIMATE CONTROL ECU)

(a) Disconnect the z54*1 or S15*2 module switch connector.

*1: except 4-Passenger with Ottoman

*2: for 4-Passenger with Ottoman





(b) Disconnect the f13*3 or f28*4 ECU connector.

*3: w/ Seat Heater System

*4: w/ Climate Control Seat System

(c) Measure the resistance according to the value(s) in the table below.

(1) w/ Seat Heater System

Standard resistance:

except 4-Passenger with Ottoman
for 4-Passenger with Ottoman










Standard voltage:

except 4-Passenger with Ottoman
for 4-Passenger with Ottoman










(2) w/ Climate Control Seat System

Standard resistance:

except 4-Passenger with Ottoman
for 4-Passenger with Ottoman










Standard voltage:

except 4-Passenger with Ottoman
for 4-Passenger with Ottoman










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - BATTERY AND BODY GROUND)

(a) Disconnect the f13*1 or f28*2 ECU connector.

:1: w/ Seat Heater System

*2: w/ Climate Control Seat System





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

Standard resistance:

w/ Climate Control Seat System
w/ Seat Heater System










Standard voltage:

w/ Climate Control Seat System
w/ Seat Heater System










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. REPLACE REAR SEAT CLIMATE CONTROL ECU LH

(a) Temporarily replace the rear seat climate control ECU LH with a new or normally functioning one.

for Power Seat: Disassembly

for Ottoman: Disassembly

for Fixed Seat Type: Disassembly

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

NEXT -- Continue to next step.

6. CHECK FOR DTC

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

Result





E -- REPLACE REAR POWER SEAT MODULE SWITCH Disassembly

D -- REPLACE REAR POWER SEAT MODULE SWITCH Disassembly

C -- REPLACE REAR POWER SEAT MODULE SWITCH Disassembly

B -- REPLACE REAR POWER SEAT MODULE SWITCH Removal

A -- END (REAR SEAT CLIMATE CONTROL ECU LH IS DEFECTIVE)