Toyota RAV4 manuals

Toyota Sienna Service Manual: 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 seconds.

DTC No.

DTC Detection Condition

Trouble Area

B1271

Combination meter communication stops
  • Combination meter
  • Wire harness

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK HARNESS AND CONNECTOR (COMBINATION METER - BATTERY)

CHECK HARNESS AND CONNECTOR (COMBINATION METER - BATTERY)

  1. Disconnect the C10 connector.
  2. Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

2 CHECK HARNESS AND CONNECTOR (COMBINATION METER - GROUND)

CHECK HARNESS AND CONNECTOR (COMBINATION METER - GROUND)

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

Standard resistance

Standard resistance

3 CHECK COMMUNICATION LINE

CHECK COMMUNICATION LINE

  1. Disconnect the A9 and G4 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 COMBINATION METER

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. ...

Power Seat ECU Communication Stop
DTC B1272 Power Seat ECU Communication Stop DESCRIPTION This DTC is detected when communication between the seat position control ECU and the multiplex network gateway ECU stops for more than 10 ...

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Vehicle Speed Signal Circuit between Radio and Navigation Assembly and Combination Meter
DESCRIPTION The radio and navigation assembly receives a vehicle speed signal from the combination meter and information about the GPS antenna, and then adjusts vehicle position. HINT:  A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter. The sig ...

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DTC B1771 Passenger Side Buckle Switch Circuit Malfunction DESCRIPTION The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner belt assembly RH. DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch ci ...

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