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 (B1266 and B1267) are detected at the same time as "communication stop" DTC B1205, repair the "+B or GND short malfunction of communication bus" DTCs first.

INSPECT FUSE (ECU-IG NO. 2)
1. Remove the ECU-IG No. 2 fuse from the instrument panel J/B.
2. Measure the resistance of the fuse.
  Standard resistance:
  
  Below 1 Ω
NG: REPLACE FUSE

OK: Go to Next Step

CHECK WIRE HARNESS (AFS ECU - BATTERY AND BODY GROUND)

Fig 1: Identifying A14 ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the A14 ECU connector.
Turn the ignition switch to the ON position.

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

Standard voltage

VOLTAGE SPECIFICATION TABLE

Tester Connection	Condition	Specified Condition
IG (A14-2) - Body ground	Turn the ignition switch to the ON position	10 to 14 V
IGS (A14-12) - Body ground	Turn the ignition switch to the ON position	10 to 14 V

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester Connection	Specified Condition
E1 (A14-1) - Body ground	Below 1 Ω
E1S (A14-11) - 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 A14 & P22 ECU Connector Terminals

Disconnect the A14 and P22 ECU connectors.

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

Standard resistance

RESISTANCE SPECIFICATION TABLE

Tester Connection	Specified Condition
MPX1 (A14-5) - MPX1 (P22-7)	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE AFS ECU