Inspection Procedure

1. Remove the SEAT-A/C FAN fuse from the cowl side junction block RH.
2. Remove the SEAT-A/C RH fuse from the engine room relay block.
3. Remove the LH-IG fuse from the main body ECU.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   SEAT-A/C FAN fuse	Always	Below 1 Ω
   SEAT-A/C RH fuse	Always	Below 1 Ω
   LH-IG fuse	Always	Below 1 Ω

NG: REPLACE FUSE 

OK: Go to Next Step 

1. Disconnect the c24 ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   c24-12 (GND) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying c24 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage 

   STANDARD VOLTAGE SPECIFICATIONS
   
   

   Tester Connection	Switch Condition	Specified Condition
   c24-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
   c24-2 (B) - Body ground	Always	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Disconnect the E92 switch connector.
2. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   E92-2 (E) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying E92 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage 

   STANDARD VOLTAGE SPECIFICATIONS
   
   

   Tester Connection	Switch Condition	Specified Condition
   E92-7 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Disconnect the E92 switch connector.
2. Measure the resistance according to the value(s) in the table below

   Standard Resistance 

   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Switch Condition	Specified Condition
   5(V5R) - 4(VSR)	Max cool → Max warm	Below 1 Ω → 5 kΩ

   Fig 3: Identifying E92 Climate Control Seat Switch RH Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE CLIMATE CONTROL SEAT SWITCH RH  (See REMOVAL  )

OK: Go to Next Step 

1. Disconnect the c24 ECU connector.
2. Disconnect the E92 switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   c24-14 (V5) - E92-5 (V5R)	Always	Below 1 Ω
   c24-18 (VS) - E92-4 (VSR)	Always	Below 1 Ω
   c24-15 (VG) - E92-3 (VGR)	Always	Below 1 Ω
   c24-14 (V5) - Body ground	Always	10 kΩ or higher
   c24-18 (VS) - Body ground	Always	10 kΩ or higher
   c24-15 (VG) - Body ground	Always	10 kΩ or higher

   Fig 4: Identifying c24 ECU And E92 Switch Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE SEAT CLIMATE CONTROL ECU  (See DISASSEMBLY  )