Air Conditioning Amplifier Communication Stop Mode: Procedure

1. Turn the ignition switch off.
   Fig 1: Identifying Air Conditioning Amplifier E8 & E73 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *A	for 2AZ-FE
   *B	for 2ZR-FE
   *a	Front view of wire harness connector: (to Air Conditioning Amplifier)

2. Disconnect the air conditioning amplifier connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   FOR 2AZ-FE
   
   

   Tester Connection	Switch Condition	Specified Condition
   E8-2 (CANH) - E8-3 (CANL)	Ignition switch off	54 to 69 Ω

   FOR 2ZR-FE
   
   

   Tester Connection	Switch Condition	Specified Condition
   E73-8 (CANH) - E73-9 (CANL)	Ignition switch off	54 to 69 Ω

NG → REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER BRANCH WIRE) 

OK: Go to next step 

1. Disconnect the air conditioning amplifier connector.
   Fig 2: Identifying Air Conditioning Amplifier E8 & E73 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *A	for 2AZ-FE
   *B	for 2ZR-FE
   *a	Front view of wire harness connector: (to Air Conditioning Amplifier)

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   FOR 2AZ-FE
   
   

   Tester Connection	Condition	Specified Condition
   E8-12 (GND) - Body ground	Always	Below 1 Ω

   FOR 2ZR-FE
   
   

   Tester Connection	Condition	Specified Condition
   E73-24 (GND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   FOR 2AZ-FE
   
   

   Tester Connection	Switch Condition	Specified Condition
   E8-8 (IG+) - Body ground	Ignition switch ON	10 to 14 V

   FOR 2ZR-FE
   
   

   Tester Connection	Switch Condition	Specified Condition
   E73-14 (IG+) - Body ground	Ignition switch ON	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3