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

Rear Door ECU LH Communication Stop

DTC B1217 Rear Door ECU LH Communication Stop DESCRIPTION DTC B1217 is output when communication between the power slide door ECU LH and the multiplex network gateway ECU stops for more than 10 s ...

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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SFR Solenoid Circuit
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Disassembly
1. REMOVE NO. 1ULTRASONIC SENSOR RETAINER (w/ Clearance Sonar System) (See page PM-19) 2. REMOVE NO. 1 ULTRASONIC SENSOR (w/ Clearance Sonar System) (See page PM-19) 3. REMOVE REAR BUMPER ENERGY ABSORBER 4. REMOVE REAR BUMPER BAR PLATE Remove the 4 clips and the rear bumper bar plate. 5. ...