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.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR POWER SEAT MODULE SWITCH)

Disconnect the L76 amplifier connector
Disconnect the z54*1 or S15*2 module switch connector
Measure the resistance and voltage according to the value(s) in the table below

Standard resistance

w/o Ottoman:

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
L76-21 (LIN3) - z54-14 (RCLN)	Always	Below 1 Ω
L76-21 (LIN3) or z54-14 (RCLN) - Body ground	Always	10 kΩ or higher

w/ Ottoman:

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
L76-21 (LIN3) - S15-13 (RCLN)	Always	Below 1 Ω
L76-21 (LIN3) or S15-13 (RCLN) - Body ground	Always	10 kΩ or higher

Standard voltage

w/o Ottoman:

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
L76-21 (LIN3) or z54-14 (RCLN) - Body ground	Always	Below 1 V

w/ Ottoman:

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
L76-21 (LIN3) or S15-13 (RCLN) - Body ground	Always	Below 1 V

Fig 1: Identifying Rear Power Seat Switch Connectors Z54, S15 & A/C Amplifier Connector L76

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (REAR POWER SEAT MODULE SWITCH - BATTERY AND BODY GROUND)

Disconnect the z54*1 or S15*2 module switch connector
Measure the resistance and voltage according to the value(s) in the table below

Standard resistance

w/o Ottoman:

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
z54-3 (E) - Body ground	Always	Below 1 Ω

w/ Ottoman:

RESISTANCE REFERENCE

Tester Connection	Condition	Specified Condition
S15-5 (E) - Body ground	Always	Below 1 Ω

Standard voltage

w/o Ottoman:

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
z54-11 (B) - Body ground	Always	11 to 14 V

w/Ottoman:

VOLTAGE SPECIFICATION

Tester Connection	Condition	Specified Condition
S15-6 (B) - Body ground	Always	11 to 14 V

Fig 2: Identifying Identifying Rear Power Seat Switch Connectors Z54 & S15

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK REAR POWER SEAT MODULE SWITCH (OPERATION)
1. Temporarily replace the rear power seat module switch with a new or normally functioning one (See REMOVAL )
2. Check the rear air conditioning function is normal
  OK: Rear air conditioning function is normal.
NG: REPLACE AIR CONDITIONING AMPLIFIER

OK: END (REAR POWER SEAT MODULE SWITCH IS DEFECTIVE)