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

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Other materials:

Engine unit
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DTC check / clear
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