Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: First perform the communication function inspections in HOW TO PROCEED WITH TROUBLESHOOTING to confirm that there are no LIN communication malfunctions before troubleshooting this symptom.

CHECK CONDITION

Check the malfunction conditions

Result

RESULT CHART

Result	Proceed to
All conditions below	A
Power switch ON (ACC) or (IG) → Power switch OFF	B
All doors open → a door opened	C
All doors locked → a door unlocked	D

B: REPLACE MAIN BODY ECU

C: GO TO PROBLEM SYMPTOMS TABLE (COURTESY LIGHT) (See PROBLEM SYMPTOMS TABLE )

D: GO TO PROBLEM SYMPTOMS TABLE (DOOR UNLOCK) (See PROBLEM SYMPTOMS TABLE )

A: Go to next step

CONFIRM LIGHT POSITION

Check the malfunctioning dome light

Result

RESULT CHART

Result	Proceed to
Front dome light and rear dome light	A
Front dome light	B
Rear dome light	C

B: REPLACE MAP LIGHT ASSEMBLY (See REMOVAL )

C: Go to step 4

A: Go to next step

CHECK HARNESS AND CONNECTOR (BATTERY - MAP LIGHT)

Disconnect the X4 light connector

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
X4-27 (DOME) - Body ground	Always	11 to 14 V

Fig 1: Identifying X4 Light Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAP LIGHT ASSEMBLY (See REMOVAL )

CHECK MAP LIGHT ASSEMBLY (ILLB VOLTAGE)

Remove the map light with connecting connector.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
X4-11 (ILLB) - Body ground	Always	11 to 14 V

Fig 2: Identifying X4 Light ILLB Voltage Connector Terminals

NG: REPLACE MAP LIGHT ASSEMBLY (See REMOVAL )

OK: Go to next step

CHECK HARNESS AND CONNECTOR (MAP LIGHT - REAR MAP LIGHT)

Disconnect the X4, X6 and X12 light connectors.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART

Tester Connection	Condition	Specified Condition
X4-11 (ILLB) - X12-8 (B)	Always	Below 1 Ω
X6-18 (RILL) - X12-9 (E)	Always	Below 1 Ω
X4-11 (ILLB) - Body ground	Always	10 kΩ or higher
X6-18 (RILL) - Body ground	Always	10 kΩ or higher

Fig 3: Identifying X4, X6 And X12 Light Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK REAR MAP LIGHT (OPERATION)
1. Temporarily replace the rear map light with a new or normally functioning one (see REMOVAL ).
2. Check the rear map light operation
  OK: Rear map light operation is normal.
NG: REPLACE MAP LIGHT ASSEMBLY (See REMOVAL )

OK: END (REPLACE REAR MAP LIGHT) (See REMOVAL )