Inspection Procedure

1. Remove the SEAT-A/C FAN fuse from the cowl side junction block RH.
2. Remove the SEAT-A/C LH 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 LH fuse	Always	Below 1 Ω
   LH-IG fuse	Always	Below 1 Ω

NG: REPLACE FUSE 

OK: Go to Next Step 

1. Disconnect the c38 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
   c38-12 (GND) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   STANDARD VOLTAGE SPECIFICATIONS
   
   

   Tester Connection	Switch Condition	Specified Condition
   c38-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
   c38-2 (B) - Body ground	Always	11 to 14 V

   Fig 1: Identifying c38 ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Disconnect the E93 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
   E93-2 (E) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   STANDARD VOLTAGE SPECIFICATIONS
   
   

   Tester Connection	Switch Condition	Specified Condition
   E93-7 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

   Fig 2: Identifying E93 Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Disconnect the E93 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(V5L) - 4(VSL)	Max cool → Max warm	Below 1 Ω → 5 kΩ

   Fig 3: Identifying E93 Climate Control Seat Switch LH Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: Go to Next Step 

1. Disconnect the c38 ECU connector.
2. Disconnect the E93 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
   c38-14 (V5) - E93-5 (V5L)	Always	Below 1 Ω
   c38-18 (VS) - E93-4 (VSL)	Always	Below 1 Ω
   c38-15 (VG) - E93-3 (VGL)	Always	Below 1 Ω
   c38-14 (V5) - Body ground	Always	10 kΩ or higher
   c38-18 (VS) - Body ground	Always	10 kΩ or higher
   c38-15 (VG) - Body ground	Always	10 kΩ or higher

   Fig 4: Identifying c38 ECU And E93 Switch Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE SEAT CLIMATE CONTROL ECU  (See DISASSEMBLY  )