DTC B1262: A/C ECU Communication Stop: Procedure

1. Disconnect the J58 connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J58-1 (B) - Body ground	Always	11 to 14 V

   Standard Resistance

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

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the J76 connector.
2. Disconnect the J34 connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J58-31 (MPX-) - J34-6 (MPX+)	Always	Below 1 Ω
   J58-30 (MPX+) - J76-13 (MPI2)	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Air Conditioning Amplifier Assembly)	*2	Front view of wire harness connector (to Combination Meter Assembly)
   *3	Front view of wire harness connector (to Gateway ECU)	-	-

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the air conditioning amplifier assembly. Refer to REMOVAL [08/2012 - ] .

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR [08/2012 - ] .
2. Recheck for DTCs.

   OK

   DTC B1262 is not output.

NG → See step   5 

OK → END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)