Toyota Sienna Service Manual: A/C ECU Communication Stop

Toyota Sienna Service Manual / Multiplex communication / System description / Diagnostic trouble code chart / 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

Disconnect the A9 connector.
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

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

Disconnect the C10 and A21 connectors.
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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