Steering Pad Switch Circuit

DESCRIPTION

This circuit sends an operation signal from the steering pad switch to the radio receiver.
If there is an open in the circuit, the audio system cannot be operated by the steering pad switch.
If there is a short in the circuit, the same condition as that when the switch is continuously depressed occurs.
Therefore, the radio receiver cannot be operated by the steering pad switch, and also the radio receiver itself cannot function.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

The vehicle is equipped with an SRS (Supplemental Restraint System) such as airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the Supplemental Restraint System (Click here).

1. INSPECT RADIO RECEIVER

1. Disconnect the radio receiver connector R4.

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   SW1 - SWG	No switch is pushed	Approx. 100 kΩ
   SW1 - SWG	SEEK+ switch: push	Approx. 0 Ω
   SW1 - SWG	SEEK- switch: push	Approx. 0.3 kΩ
   SW1 - SWG	VOL+ switch: push	Approx. 1 kΩ
   SW1 - SWG	VOL- switch: push	Approx. 3.2 kΩ
   SW2 - SWG	No switch is pushed	Approx. 100 kΩ
   SW2 - SWG	MODE switch: push	Approx. 0 Ω

NG	Go to step 2

OK
RETURN TO THE ORIGINAL INSPECTION FLOW BECAUSE THE CHECK RESULT IS NORMAL

2. INSPECT STEERING PAD SWITCH LH

1. Disconnect the steering pad switch LH connector.

2. Measure the resistance according to the values in the table below.
   
   

   Standard resistance:

   Tester connection	Condition	Specified condition
   AU1 - EAU	No switch is pushed	Approx. 100 kΩ
   AU1 - EAU	SEEK+ switch: push	Approx. 0 Ω
   AU1 - EAU	SEEK- switch: push	Approx. 0.3 kΩ
   AU1 - EAU	VOL+ switch: push	Approx. 1 kΩ
   AU1 - EAU	VOL- switch: push	Approx. 3.2 kΩ
   AU2 - EAU	No switch is pushed	Approx. 100 kΩ
   AU2 - EAU	MODE switch: push	Approx. 0 Ω

NG	REPLACE STEERING PAD SWITCH LH

OK

3. INSPECT SPIRAL CABLE

1. Disconnect the steering pad switch and spiral cable connectors.

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   EAU - EAU	Always	Below 1 Ω
   AU1 - AU1	Always	Below 1 Ω
   AU2 - AU2	Always	Below 1 Ω

OK	REPAIR OR REPLACE HARNESS OR CONNECTOR (SPIRAL CABLE - RADIO RECEIVER)

NG
REPLACE SPIRAL CABLE