DTC B1262: A/C ECU Communication Stop: Procedure
- CHECK FUSE (A/C)
- Remove the A/C fuse from the main body ECU LH (cowl side junction block LH).
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A/C fuse Always Below 1 Ω
NG → REPLACE FUSE (A/C)
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY AND BODY GROUND)
- Disconnect the J58 connector.
- 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 A/C Amplifier)
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (A/C AMPLIFIER - BATTERY AND BODY GROUND)
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (COMMUNICATION LINE)
- Disconnect the J58, J34 and J76 connectors.
- 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 A/C Amplifier)*2 Front view of wire harness connector
(to Combination Meter Assembly)*3 Front view of wire harness connector
(to Gateway ECU)- -
NG → REPLACE HARNESS OR CONNECTOR
OK → See step 4
- REPLACE A/C AMPLIFIER ASSEMBLY. Refer to REMOVAL