Steering Pad Switch Circuit

AIR CONDITIONING: AIR CONDITIONING SYSTEM: Steering Pad Switch Circuit

Steering Pad Switch Circuit

DESCRIPTION

AUTO, TEMP UP (+), TEMP DOWN (-), Recirculation / Fresh, Fr. DEF and Rr. DEF switches are located on the steering pad switch.
The resistance of the steering pad switch changes in accordance with switch operation. The air conditioning amplifier outputs voltage to the steering pad switch and reads voltage changes according to the resistance changes with switch operation.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK AIR CONDITIONING AMPLIFIER (ST1, ST2 VOLTAGE)




(a) Remove the air conditioning with connectors still connected.
(b) Measure the voltage of the wire harness side connectors.
Standard voltage:






OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.

2. INSPECT STEERING PAD SWITCH LH




(a) Remove the steering pad switch LH.
(b) Measure the resistance of the connectors.
Standard resistance:






NG -- REPLACE STEERING PAD SWITCH LH
OK -- Continue to next step.

3. INSPECT STEERING PAD SWITCH RH




(a) Remove the steering pad switch RH.
(b) Measure the resistance of the connector.
Standard resistance:






NG -- REPLACE STEERING PAD SWITCH RH
OK -- Continue to next step.

4. INSPECT STEERING PAD SWITCH ASSEMBLY




(a) Connect the steering pad switch RH and LH to the steering pad switch cable.
(b) Measure the resistance of the connector.
Standard resistance:






NG -- REPLACE STEERING PAD SWITCH ASSEMBLY
OK -- Continue to next step.

5. INSPECT SPIRAL CABLE SUB-ASSEMBLY




(a) Remove the spiral cable.
(b) Measure the resistance of the connectors.
Standard resistance:






NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY
OK -- Continue to next step.

6. CHECK WIRE HARNESS (STEERING PAD SWITCH - AIR CONDITIONING AMPLIFIER)




(a) Disconnect the C12 steering pad connector.
(b) Disconnect the A7 amplifier connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE AIR CONDITIONING AMPLIFIER