Check Power Supply And Ground Circuit (Rear)

1. Disconnect the seat heater control module harness connector.
2. Measure the voltage between harness connector terminal and chassis ground.

   Connector & terminal 

   (R49) No. 14 (+) - Chassis ground (-):

Is the voltage 10 V or more?

• Yes: Go to 2  .
• No: Repair or replace the harness.

1. Turn the ignition switch to ON.
2. Measure the voltage between harness connector terminal and chassis ground.

   Connector & terminal 

   (R49) No. 5 (+) - Chassis ground (-):

Is the voltage 10 V or more?

• Yes: Go to 3  .
• No: Repair or replace the harness.

Measure the resistance between harness connector terminal and chassis ground.

Connector & terminal 

(R49) No. 7 - Chassis ground:

(R138) No. 9 - Chassis ground:

Is the resistance less than 10 Ω?

• Yes: Go to 4  .
• No: Repair the harness.

Measure the resistance between seat heater control module terminal and seat heater switch - rear terminal.

Connector & terminal 

(R53) No. 14 - (R138) No. 1:

(R53) No. 16 - (R138) No. 6:

(R53) No. 6 - (R138) No. 2:

(R53) No. 4 - (R138) No. 6:

(R53) No. 2 - (R138) No. 13:

(R53) No. 8 - (R138) No. 4:

Is the resistance less than 10 Ω?

• Yes: Go to 5  .
• No: Repair the harness.

Check the seat heater module (rear) as a single part. Go to 5  .

Is the inspection result normal?

• Yes: Replace the seat heater switch - rear or seat heater control module.
• No: Replace the seat heater module (rear).