Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

When "+B or GND short malfunction of communication bus" DTCs (B1214 and B1215) are detected at the same time as "communication stop" DTC B1209, repair the "+B or GND short malfunction of communication bus" DTCs first.

INSPECT FUSE (ECU-B)
1. Remove the ECU-B fuse from the fusible link block.
2. Measure the resistance of the fuse.
  Standard resistance:
  
  Below 1 Ω
NG: REPLACE FUSE

OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU - BATTERY AND BODY GROUND)

Fig 1: Identifying R26 ECU Connector Terminals

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Disconnect the R26 ECU connector.

Measure the voltage and resistance of the wire harness side connector.

Standard voltage

VOLTAGE SPECIFICATION TABLE

Tester Connection	Condition	Specified Condition
CPUB (R26-7) - Body ground	Always	10 to 14 V

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester Connection	Specified Condition
GND (R26-1) - Body ground	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK RESISTANCE OF COMMUNICATION LINE

Fig 2: Identifying R26 & P22 ECU Connector Terminals

Disconnect the R26 and P22 ECU connectors.

Measure the resistance between the specified terminals on the wire harness side connectors.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
MPX1 (R26-6) - MPX1 (P22-7)	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE OUTER MIRROR CONTROL ECU