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: When using the Intelligent tester or Techstream with the power switch OFF to troubleshoot:
Connect the Intelligent tester or Techstream to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the tester and vehicle begins.

HINT:

When DTC U1127, U1128 and U1129 are output simultaneously, perform troubleshooting for "Driver Side Switch Module LIN Communication Malfunction" first (see DRIVER SIDE SWITCH MODULE LIN COMMUNICATION MALFUNCTION )

CLEAR DTC
1. Clear the DTC (see DTC CHECK / CLEAR )

CHECK FOR DTC

Recheck for DTC (see DTC CHECK / CLEAR )

Result:

RESULT REFERENCE

Result	Proceed to
DTC U1127 output reoccurs	A
DTC U1127 output does not reoccur	B

B: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH TROUBLESHOOTING )

A: Go to next step

CHECK HARNESS AND CONNECTOR (OUTER MIRROR SWITCH - NO. 1 CONSOLE SWITCH)

Fig 1: Identifying L6 And L75 Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the L6 and L75 switch connectors.
Measure the resistance and voltage according to the value(s) in the table below.

Standard resistance

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
L6-7 (MPX) - L75-3 (MPX)	Always	Below 1 Ω
L6-7 (MPX) or L75-3 (MPX) - Body ground	Always	10 kΩ or higher

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
L6-7 (MPX) or L75-3 (MPX) - Body ground	Always	Below 1 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (NO. 1 CONSOLE SWITCH - BATTERY AND BODY GROUND)

Disconnect the L75 switch connector
Measure the resistance and voltage according to the value(s) in the table below