Toyota RAV4 manuals

Toyota Sienna Service Manual: A/C ECU Communication Stop

DTC B1262 A/C ECU Communication Stop

DESCRIPTION

DTC B1262 is output when communication between the A/C amplifier and the multiplex network gateway ECU stops for more than 10 seconds.

DTC No.

DTC Detection Condition

Trouble Area

B1262

A/C ECU communication stops
  • A/C amplifier
  • Wire harness

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)

 CHECK HARNESS AND CONNECTOR

  1. Disconnect the A9 connector.
  2. Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

HINT:
*1: for Automatic A/C
*2: for Manual A/C

2 CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - GROUND)

CHECK HARNESS AND CONNECTOR

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

Standard resistance

Standard resistance

HINT:
*1: for Automatic A/C
*2: for Manual A/C

3 CHECK COMMUNICATION LINE

CHECK COMMUNICATION LINE

  1. Disconnect the C10 and A21 connectors.
  2. Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

HINT:
*1: for Automatic A/C
*2: for Manual A/C

Result

Result

REPLACE A/C AMPLIFIER

Rear Door ECU LH Communication Stop
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Combination Meter ECU Communication Stop
DTC B1271 Combination Meter ECU Communication Stop DESCRIPTION DTC B1271 is output when communication between the combination meter and the multiplex network gateway ECU stops for more than 10 se ...

Other materials:

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Removal
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