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 ...

Other materials:

Ignition key cylinder light
ON-VEHICLE INSPECTION 1. KEY CYLINDER LIGHT ASSEMBLY  Connect the battery positive (+) lead to the terminal 1 and the battery negative (-) lead to the terminal 2, and check that the indicator light comes on. 2. TRANSPONDER KEY AMPLIFIER  Inspect key cylinder light o ...

No Master/ Connection Check Error
DTC 01-D6 No Master DTC 01-D7 Connection Check Error DESCRIPTION HINT:  *1: Even if no fault is present, this trouble code may be stored depending on the battery condition or engine start voltage.  *2: When 210 seconds have elapsed after disconnecting the power supply ...

Locking the front doors from the outside without a key
Move the inside lock button to the lock position. Close the door. Vehicles without a smart key system The doors cannot be locked if either of the front doors is open and the key is in the engine switch. Vehicles with a smart key system The door cannot be locked if the engine switc ...

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