Rear Air Conditioning Control Panel Circuit: Procedure

1. Disconnect the R1 rear air conditioning control connector.
   Fig 1: Checking Harness And Connector (Rear Air Conditioning Control - Body Ground)

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

   Standard resistance

   Tester Connection	Condition	Specified Condition
   R1-10 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the R1 rear air conditioning control connector.
   Fig 2: Checking Harness And Connector (Rear Air Conditioning Control - Battery)

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

   Standard voltage

   Tester Connection	Condition	Specified Condition
   R1-10 (E) - R1-2 (IG+)	Ignition switch on (IG)	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the R1 control connector.
   Fig 3: Checking Harness And Connector (Air Conditioning Amplifier - Rear Air Conditioning Control)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D38 amplifier connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D38-13 (RLIN) - R1-5 (MPX-)	Always	Below 1 Ω
   D38-13 (RLIN) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the rear air conditioning control. Refer to REMOVAL - Step 2 .

NEXT: Go to next step 

1. Operate the rear air conditioning control to check that it functions properly.

   OK

   Rear air conditioning control function operates normally.

NG → See step   5 

OK → END (REAR AIR CONDITIONING CONTROL IS DEFECTIVE)