Rear Left Seat's Seat Heater does not Operate: Procedure

1. Remove the RR-IG1-3 fuse from the luggage room junction block.
2. Remove the P RR S/HTR fuse from passenger side junction block.
3. Measure the resistance of the fuses.

   Standard resistance

   Tester Connector	Condition	Specified Condition
   RR-IG1-3 fuse	Always	Below 1 Ω
   P RR S/HTR fuse	Always	Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Disconnect the f13 ECU connector.
   Fig 1: Identifying Seat Climate Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage and resistance according to the value(s) in the table blow.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   f13-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
   f13-2 (SYSB) - body ground	Always	11 to 14 V

   Standard resistance

   Tester Connection	Condition	Specified Condition
   f13-12 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check the Data List for proper functioning of the rear seat heater switch.
   REAR CONSOLE SWITCH
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   RL Seat A/C Main Switch	Rear left seat heater switch signal/ON or OFF	ON: Rear seat heater switch LH ON OFF: Rear seat heater switch LH OFF	-
   RL Seat A/C Volume Switch	Rear left seat heater switch signal (volume)/MIN: LEVEL 1, MAX: LEVEL 14 or NG	Within range from LEVEL 1 to LEVEL 14 NG: Rear seat heater switch LH malfunction	-

   OK

   The display is as specified in the normal condition.

NG → See step   4 

OK → See step   5 

1. Disconnect the r1 and r3 switch connectors.
   Fig 2: Checking Harness And Connector (Rear Power Seat Module Switch Curtain Switch - And Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table blow.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   r1-6 (BVR) - r3-17 (BVR)	Always	Below 1 Ω
   r1-7 (SW2) - r3-18 (SW2)	Always	Below 1 Ω
   r1-9 (L VR) - r3-20 (L VR)	Always	Below 1 Ω
   r1-6 (BVR) - Body ground	Always	10 kΩ or higher
   r1-7 (SW2) - Body ground	Always	10 kΩ or higher
   r1-9 (L VR) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6