Rear Heater Control Panel LIN Communication Malfunction

MULTIPLEX COMMUNICATION: LIN COMMUNICATION SYSTEM: Rear Heater Control Panel LIN Communication Malfunction
- Rear Heater Control Panel LIN Communication Malfunction

DESCRIPTION

The LIN communication of the components related to the rear heater occurs between the air conditioning amplifier (A/C ECU) and rear power seat module switch.

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.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR POWER SEAT MODULE SWITCH)

(a) Disconnect the L76 amplifier connector.





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

*1: except 4-Passenger with Ottoman

*2: for 4-Passenger with Ottoman

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

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.

2. CHECK HARNESS AND CONNECTOR (REAR POWER SEAT MODULE SWITCH - BATTERY AND BODY GROUND)

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

*1: except 4-Passenger with Ottoman

*2: for 4-Passenger with Ottoman





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

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.

3. CHECK REAR POWER SEAT MODULE SWITCH (OPERATION)

(a) Temporarily replace the rear power seat module switch with a new or normally functioning one.

for Power Seat: Disassembly

for Ottoman: Disassembly

for Fixed Seat Type: Disassembly

(b) Check the rear air conditioning function is normal.

OK:

Rear air conditioning function is normal.

NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal

OK -- END (REAR POWER SEAT MODULE SWITCH IS DEFECTIVE)