Inspection Procedure

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

INSPECT FUSE (AM2)
1. Remove the AM2 fuse from the engine room J/B.
2. Measure the resistance of the fuse.
  Standard resistance: Below 1 Ω
NG: REPLACE FUSE

OK: Go to Next Step
CHECK CONNECTORS
1. Check that the connectors are securely connected and the terminals are not deformed or loose.
  OK: The connectors are securely connected and the terminals are not deformed or loose.
NG: REPAIR OR REPLACE CONNECTORS

OK: Go to Next Step

CHECK WIRE HARNESS (MAIN BODY ECU - BATTERY)

Disconnect the E60 and E61 ECU connectors.

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

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
E61-6 (AM1) - Body ground	Always	10 to 14 V
E60-1 (AM2) - Body ground	Always	10 to 14 V

Fig 1: Identifying Main Body ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK WIRE HARNESS (MAIN BODY ECU - BODY GROUND)

Disconnect the DF ECU connector.

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

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
DF-10 (GND1) - Body ground	Always	Below 1 Ω

Fig 2: Identifying Main Body ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

INSPECT RELAY (ACC RELAY)

Remove the ACC relay from the instrument panel J/B.

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

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

Fig 3: Identifying ACC Relay Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RELAY

OK: Go to Next Step

CHECK WIRE HARNESS (INSTRUMENT PANEL J/B - MAIN BODY ECU)

Disconnect the E61 ECU connector.

Fig 4: Identifying Main Body ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the Dl J/B connector.

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

Standard resistance

RESISTANCE SPECIFICATION

Terminal No. (Symbol)	Condition	Specified Condition
DI-3 - E61-22 (ACCD)	Always	Below 1 Ω
E61-22 or DI-3 - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK WIRE HARNESS (INSTRUMENT PANEL J/B - BATTERY AND BODY GROUND)

Disconnect the DF and DA J/B connectors.

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

Standard resistance

RESISTANCE SPECIFICATION

Terminal No.	Condition	Specified Condition
DF-10 - Body ground	Always	Below 1 Ω

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

Standard voltage

VOLTAGE SPECIFICATION

Terminal No.	Condition	Specified Condition
DA-1 - Body ground	Always	10 to 14 V

Fig 5: Identifying Instrument Panel J/B Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

INSPECT INSTRUMENT PANEL J/B

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

Fig 6: Identifying Instrument Panel J/B And ACC Relay Connector Terminals

Standard resistance

RESISTANCE SPECIFICATION

Terminal No.	Condition	Specified Condition
ACC relay terminal 1 - DF-10	Always	Below 1 Ω
ACC relay terminal 2 - DI-3	Always	Below 1 Ω
DF-10 - Body ground	Always	10 kΩ or higher
DI-3 - Body ground	Always	10 kΩ or higher

NG: REPLACE INSTRUMENT PANEL J/B

OK: REPLACE MAIN BODY ECU