Lexus NX: Air Conditioning Control Panel does not Operate

Lexus NX Service Manual / Power Source & Network / Networking / Lin Communication System / Air Conditioning Control Panel does not Operate

DESCRIPTION

A malfunction occurs in LIN communication of the components related to the air conditioning between the air conditioning amplifier and air conditioning control.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the power switch off to troubleshoot:

    Connect the Techstream to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - BATTERY AND BODY GROUND)

*a

Front view wire harness connector

(to Air Conditioning Control Assembly)

(a) Disconnect the air conditioning control assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I13-14 (GND) - Body ground

Always

Below 1 Ω

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I13-8 (IG+) - Body ground

Power switch on (IG)

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AIR CONDITIONING CONTROL ASSEMBLY)

(a) Disconnect the I50 air conditioning control assembly connector.

(b) Disconnect the I13 air conditioning amplifier assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I50-37 (LIN1) - I13-6 (LIN1)

Always

Below 1 Ω

I50-37 (LIN1) or I13-6 (LIN1) - Body ground

Always

10 kΩ or higher

OK

GO TO AIR CONDITIONING SYSTEM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

READ NEXT:

 Network Gateway Ecu

ComponentsCOMPONENTS ILLUSTRATION *1 NETWORK GATEWAY ECU - - RemovalREMOVAL PROCEDURE 1. REMOVE ECU INTEGRATION BOX RH Click here 2. REMOVE NETWORK GATEWAY ECU (a) Detach the 2 claws

 Power Distribution

 Main Body Ecu

SEE MORE:

 Switch Lights of Remote Touch do not Illuminate

DESCRIPTION Power is supplied to the remote touch illumination when the light control switch is in the tail or head position. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuse for circuits related to this system before performing the following procedure. PROCEDURE 1. CONFIRM SYM

 Open in One Side of Bus 5 Branch Line

DESCRIPTION When the CAN bus main lines are normal (no open, short to ground, short to +B or short between lines) and there is an ECU or sensor on the "Communication Bus Check" screen that is indicated as not communicating or whose connection status on the "Communication Bus Check" screen changes in

© 2016-2024 Copyright www.lexunx.com