Seat Heater System: Inspection

1. Remove the D S/HTR fuse from the driver side J/B.
2. Remove the P S/HTR fuse from the passenger side J/B.
3. Remove the P-IG fuse from the passenger side J/B.
4. Remove the RR S/HTR fuse from the luggage room J/B.
5. Measure the resistance.

Standard: Below 1 Ω 

If the result is not as specified, replace the fuse.

1. Remove the D-IG1 relay from the driver side J/B.
2. Remove the P-IG1 relay from the passenger side J/B.
3. Remove the L-IG1 relay from the luggage room J/B.
4. Measure the resistance.
Fig 1: Measuring Resistance Between Relays
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard: 

If the result is not as specified, replace the relay.

1. Driver's side:

   Measure the resistance between the terminals when the switch is operated.

   Fig 2: Inspecting Front Seat Heater Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   FRONT SEAT HEATER SWITCH - RESISTANCE TABLE
   
   

   Tester Connection	Switch Condition	Specified Condition
   12 (THL) - 14 (IG)	Switch ON (LH) (Min. to Max.)	3.3 to 5.6 kΩ

   HINT:

   As the dial is being turned, the resistance changes gradually.

   If the result is not as specified, replace the switch.

2. Passenger's side:

   Measure the resistance between the terminals when the switch is operated.

Standard: 

HINT:

As the dial is being turned, the resistance changes gradually.

If the result is not as specified, replace the switch.

1. Turn the ignition switch ON.
2. Measure the voltage of the wire harness side connector.
Fig 3: Inspecting Rear Seat Heater Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard: 

If the result is not as specified, replace the switch assy.

1. Disconnect the T7 switch, S36 and S37 seat heater connectors.
2. Measure the voltage of the wire harness side connector.
   Fig 4: Identifying Seat Heater Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   SEAT HEATER CONNECTOR - VOLTAGE TABLE
   
   

   Tester Connection	Switch Condition	Specified Condition
   T7-14 (IG) - Body ground	Ignition switch OFF --> ON	Below 1 V --> 10 to 14 V
   S36-1 - Body ground	Ignition switch OFF --> ON	Below 1 V --> 10 to 14 V
   S37-1 - Body ground	Ignition switch OFF --> ON	Below 1 V --> 10 to 14 V

3. Measure the resistance of the wire harness side connectors.

Standard: 

If the voltage and resistance measurements are not as specified but the other suspected areas listed in the problem symptom table (see PROBLEM SYMPTOMS TABLE  ) are operating normally, repair or replace the wire harness and connector.

1. Disconnect the S62 switch, S40 and S41 seat heater connectors.
2. Measure the resistance of the wire harness side connector.
Fig 5: Identifying Seat Heater Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard: 

If the voltage and resistance measurements are not as specified but the other suspected areas listed in the PROBLEM SYMPTOMS TABLE  are operating normally, repair or replace the wire harness and connector.

1. Disconnect the L14 luggage room J/B ECU connector.
2. Measure the voltage and resistance of the wire harness side connector.
Fig 6: Identifying Luggage Room J/B ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard: 

If the result is not as specified, there may be a malfunction on the wire harness side.