Inspection Procedure

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

If there is not the LEXUS hand-held tester, begin with STEP 2.

Check sliding roof control switch operation.
PREPARATION:

Connect the LEXUS hand-held tester to the DLC3.

CHECK:
1. Enter DATA LIST function of LEXUS hand-held tester.
2. Check that switch status (ON/OFF) changes on the screen of LEXUS hand-held tester as the sliding roof control switch of the vehicle is turned.
  OK:
  
  The motor operates normally.
1. NG : Replace sliding roof gear assembly with ECU (See REMOVAL ).
2. OK : Go to next step.

Check sliding roof control switch.

PREPARATION:

Remove the overhead J/B assembly.

Disconnect the overhead J/B assembly connector.

CHECK:

Check continuity between terminals when the switch is operated.

OK:

SLIDING ROOF CONTROL SWITCH TERMINALS CONTINUITY

Switch position	Tester connection	Specified condition
SLIDE OPEN	1 - 10	Continuity
SLIDE OFF	-	No continuity
SLIDE CLOSE	1 - 11	Continuity
TILT DOWN	1 - 24	Continuity
TILT OFF	-	No continuity
TILT UP	1 - 25	Continuity

Fig 1: Identifying Overhead J/B Connector

NG : Replace overhead J/B assembly.
OK : Go to next step.

Check for open and short in wire harness and connectors between sliding roof gear assembly with ECU and overhead J/B assembly (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair and replace wire harness or connector.
2. OK : Proceed to next circuit inspection shown on problem symptom table (See PROBLEM SYMPTOMS TABLE ).