Inspection Procedure

HINT:

When "+B of GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1262, repair the "+B or GND short malfunction of communication bus" DTCs first.

1. CHECK FUSE (A/C) 
   1. Remove the A/C fuse from the cowl side J/B LH.
   2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

   NG: REPLACE FUSE 

   OK: Go to next step 

2. CHECK WIRE HARNESS (AIR CONDITIONING AMPLIFIER - BATTERY AND BODY GROUND) 
   1. Disconnect the J58 ECU connector.
   2. Measure the voltage and resistance of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester Connection	Condition	Specified Condition
   B (J58-1) - Body ground	Always	10 to 14 V

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester Connection	Specified Condition
   GND (J58-20) - Body ground	Below 1 Ω

   Fig 1: Identifying J58 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

3. CHECK RESISTANCE OF COMMUNICATION LINE 
   1. Disconnect the J58, A27, J34 and J76 ECU connectors.
   2. Measure the resistance of the wire harness side connector.

   Standard resistance 

Result 

Fig 2: Identifying J58, A27, J34 And J76 ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: REPLACE AIR CONDITIONING AMPLIFIER AND REPAIR OR REPLACE HARNESS OR CONNECTOR 

C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY