| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Audio/Visual/Telematics | Section: Audio/Video | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM0000012CK02XX |
| Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Steering Pad Switch Circuit |
DESCRIPTION
This circuit sends an operation signal from the steering pad switch to the radio receiver assembly.
If there is an open in the circuit, the audio system cannot be operated using the steering pad switch.
If there is a short in the circuit, the same condition as when the switch is continuously depressed occurs.
Therefore, the radio receiver assembly cannot be operated using the steering pad switch, and also the radio receiver assembly itself cannot function.
WIRING DIAGRAM
INSPECTION PROCEDURE
CAUTION:
The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the SRS
.
PROCEDURE
|
1. |
INSPECT RADIO RECEIVER ASSEMBLY |
|
(a) Disconnect the I3 radio receiver assembly connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
I3-7 (SW1) - I3-6 (SWG) |
No switch is pushed |
100 kΩ or higher |
|
Seek+ switch: push |
Below 1 Ω |
|
|
Seek- switch: push |
312 to 345 Ω |
|
|
Volume+ switch: push |
950 to 1050 Ω |
|
|
Volume- switch: push |
2954 to 3265 Ω |
|
|
I3-8 (SW2) - I3-6 (SWG) |
No switch is pushed |
100 kΩ or higher |
|
MODE switch: push |
Below 1 Ω |
|
|
On Hook switch: push |
312 to 345 Ω |
|
|
Off Hook switch: push |
950 to 1050 Ω |
(c) Reconnect the radio receiver assembly connector.
|
|
3. |
INSPECT STEERING PAD SWITCH ASSEMBLY |
(a) Disconnect the z12 steering pad switch assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
10 (AU1) - 8 (EAU) |
No switch is pushed |
100 kΩ or higher |
|
Seek+ switch: push |
Below 1 Ω |
|
|
Seek- switch: push |
312 to 345 Ω |
|
|
Volume+ switch: push |
950 to 1050 Ω |
|
|
Volume- switch: push |
2954 to 3265 Ω |
|
|
9 (AU2) - 8 (EAU) |
No switch is pushed |
100 kΩ or higher |
|
MODE switch: push |
Below 1 Ω |
|
|
On Hook switch: push |
312 to 345 Ω |
|
|
Off Hook switch: push |
950 to 1050 Ω |
(c) Reconnect the steering pad switch assembly connector.
|
|
4. |
INSPECT SPIRAL CABLE |
|
(a) Disconnect the z12 steering pad switch assembly connector. |
(b) Disconnect the H54 spiral cable connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z12-8 (EAU) - H54-4 (EAU) |
Spiral cable is turned 2.5 rotations counterclockwise |
Below 1 Ω |
|
Spiral cable is centered |
||
|
Spiral cable is turned 2.5 rotations clockwise |
||
|
z12-10 (AU1) - H54-6 (AU1) |
Spiral cable is turned 2.5 rotations counterclockwise |
|
|
Spiral cable is centered |
||
|
Spiral cable is turned 2.5 rotations clockwise |
||
|
z12-9 (AU2) - H54-5 (AU2) |
Spiral cable is turned 2.5 rotations counterclockwise |
|
|
Spiral cable is centered |
||
|
Spiral cable is turned 2.5 rotations clockwise |
CAUTION:
The spiral cable is an important part of the SRS airbag system. Incorrect removal or installation of the spiral cable may prevent the airbag from deploying. Be sure to read the PRECAUTION for the SRS
.
(d) Reconnect the steering pad switch assembly connector.
(e) Reconnect the spiral cable connector.
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