Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

CHECK AIR CONDITIONING FUNCTION
1. Check that the front deicer function operates normally.
  OK: Front deicer function operates normally.
NG: GO TO AIR CONDITIONING SYSTEM

OK: Go to Next step

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (MIRROR HEATER FUNCTION)

Select the ACTIVE TEST, use the intelligent tester to generate a control command, and then check the mirror heater function.

Multiplex network door ECU front LH, RH (driver, front passenger door ECU):

ACTIVE TEST REFERENCE

Item	Test Details	Diagnostic Note
MIR HEATER	Mirror defogger operation ON / OFF	-

Result:

RESULT REFERENCE

Result	Proceed to
Outer rear view mirror LH does not operate normally	A
Outer rear view mirror RH does not operate normally	A
Outer rear view mirror LH operates normally	B
Outer rear view mirror RH operates normally	C

B: REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH (DRIVER DOOR ECU)

C: REPLACE MULTIPLEX NETWORK DOOR ECU FRONT RH (FRONT PASSENGER DOOR ECU)

A: Go to Next step

INSPECT OUTER REAR VIEW MIRROR SUB-ASSEMBLY LH OR RH (MIRROR HEATER)

Check the operation of the mirror heater.

Measure the resistance between terminals 4 and 12 of the connector.
Standard resistance:

3.57 to 4.83 Ω at 25°C (77°F)

Apply battery voltage and check the mirror heater operation.

Fig 1: Identifying Mirror Heater Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

VOLTAGE SPECIFICATION

Measurement Condition	Specified Condition
Battery positive (+) rarr; Terminal 4 Battery negative (-) rarr; Terminal 12	Mirror becomes warm

B: REPLACE OUTER REAR VIEW MIRROR SUB-ASSEMBLY LH

C: REPLACE OUTER REAR VIEW MIRROR SUB-ASSEMBLY RH

A: Go to Next step

CHECK WIRE HARNESS (OUTER REAR VIEW MIRROR LH OR RH - MULTIPLEX NETWORK DOOR ECU FRONT LH, RH)

Disconnect the R14 or R15 mirror connector.

Fig 2: Identifying R14 Or R15 Mirror Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the D19 or P11 ECU connector.

Measure the resistance of the wire harness side connectors.

Standard resistance:

for Driver side

RESISTANCE REFERENCE

Tester Connection	Specified Condition
R14-4 - D19-13 (HTR+)	Below 1 Ω
R14-12 - D19-22 (HTR-)	Below 1 Ω

for Front passenger side

RESISTANCE REFERENCE

Tester Connection	Specified Condition
R15-4 - P11-13 (HTR+)	Below 1 Ω
R15-12 - P11-22 (HTR-)	Below 1 Ω

Result:

RESULT REFERENCE

Result	Proceed to
Driver side is not as specified	A
Front passenger side is not as specified	A
Driver side is as specified	B
Front passenger side is as specified	C

B: REPLACE MULTIPLEX NETWORK DOOR ECU FRONT LH

C: REPLACE MULTIPLEX NETWORK DOOR ECU FRONT RH

A: REPAIR OR REPLACE HARNESS OR CONNECTOR