Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS 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 cowl side J/B RH.
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 (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)

Disconnect the J55 ECU connector.

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

Standard voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
J55-33 (AM1) - Body ground	Always	10 to 14 V
J55-12 (AM2) - Body ground	Always	10 to 14 V

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

Fig 1: Identifying J55 ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
J55-6 (GND2) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

CHECK JUNCTION BLOCK

RH-IG relay:

Disconnect the cowl side J/B RH connectors.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
RD-6 - RA-5 or RD-7	Always	136 to 250 Ω at 20°C (68°F)
RD-6 - RD-12	Always	Below 1 Ω
RD-6 - Body ground	Always	10 kΩ or higher

Fig 2: Identifying Cowl Side J/B RH Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

LH-IG relay:

Disconnect the cowl side J/B LH connectors.

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
LD-13 - LD-8 or LD-9	Always	68 to 250 Ω at 20°C (68°F)

Fig 3: Identifying Cowl Side J/B LH Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 8

OK: Go to Next Step

CHECK WIRE HARNESS (COWL SIDE J/B RH - POWER SOURCE CONTROL ECU AND BODY GROUND)

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
RD-6 - J55-34 (IG1D)	Always	Below 1 Ω
RA-5 or RD-7 - Body ground	Always	Below 1 Ω
RD-6 or J55-34 (IG1D) - Body ground	Always	10 kΩ or higher

Fig 4: Identifying Cowl Side J/B RH And Power Source Control ECU Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
RD-12 - LD-13	Always	Below 1 Ω
RD-12 - Body ground	Always	10 kΩ or higher
LD-8 - Body ground	Always	Below 1 Ω
LD-9 - Body ground	Always	Below 1 Ω

Fig 5: Identifying Identifying Cowl Side J/B RH And LH Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Connect each J/B connector with the power source control ECU connector disconnected.

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

Standard voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
J55-34 (IG1D) - Body ground	Engine switch on (IG)	Below 1 V

Fig 6: Identifying J55 Power Source Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 9

OK: Go to Next Step

INSPECT POWER SOURCE CONTROL ECU

Reconnect the J55 ECU connector.

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

Standard voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
J55-34 (IG1D) - Body ground	Engine switch off	Below 1 V
J55-34 (IG1D) - Body ground	Engine switch on (IG)	8 to 14 V

Fig 7: Identifying J55 Power Source Control ECU Connector

NG: REPLACE POWER SOURCE CONTROL ECU

OK: Go to Next Step

RECHECK FOR DTC
1. Delete the DTCs (See DIAGNOSIS SYSTEM ).
2. Check for DTCs again.
  OK:
  
  DTC B2272 is not output.
NG: REPLACE POWER SOURCE CONTROL ECU

OK: CHECK INTERMITTENT PROBLEMS

REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU

Replace a faulty relay or J/B and then connect the power source control ECU connector.

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

Standard voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
J55-34 (IG1D) - Body ground	Engine switch off	Below 1 V
J55-34 (IG1D) - Body ground	Engine switch on (IG)	8 to 14 V

Fig 8: Identifying J55 Power Source Control ECU Connector

NG: REPLACE POWER SOURCE CONTROL ECU

OK: END

REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU

Repair or replace a faulty wire harness or connector and then connect the power source control ECU connector.

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

Standard voltage

STANDARD VOLTAGE SPECIFICATION

Tester Connection (Symbols)	Condition	Specified Condition
J55-34 (IG1D) - Body ground	Engine switch off	Below 1 V
J55-34 (IG1D) - Body ground	Engine switch on (IG)	8 to 14 V

Fig 9: Identifying J55 Power Source Control ECU Connector

NG: REPLACE POWER SOURCE CONTROL ECU

OK: END