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.

Check voltage between terminals S5V1 and SG1, S5V2 and SG2 of ECU connector.
PREPARATION:

Remove ECU with connectors still connected.

CHECK:

Measure voltage between terminals S5V1 and SG1, S5V2 and SG2 of ECU connector.

OK:

Voltage: 4.5 - 5.5 V

Fig 1: Measuring Voltage Between Terminals S5V1 And SG1, S5V2 And SG2 Of ECU Connector
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1. NG : Go to step 3 .
2. OK : Go to next step.
Check for open circuit in harness and connector between terminals S5V1 and SG1, S5V2 and SG2 of ECU connector (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace harness or connector.
2. OK : Proceed to next circuit inspection shown on the problem symptoms table (See PROBLEM SYMPTOMS TABLE ).
Check for short circuit in harness between terminals S5V1 and SG1, S5V2 and SG2, of ECU connector (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG : Repair or replace harness or connector.
2. OK : Check and replace power tilt and power telescopic ECU (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).