| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Audio/Visual/Telematics | Section: Navigation/Multi Info Display | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM0000011FP03FX |
| Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Steering Pad Switch Circuit |
DESCRIPTION
This circuit sends an operation signal from the steering pad switch assembly to the navigation receiver assembly.
If there is an open in the circuit, the navigation system cannot be operated using the steering pad switch assembly.
If there is a short in the circuit, the resulting condition is the same as if the switch were continuously depressed. Therefore, the navigation system cannot be operated using the steering pad switch assembly, and the navigation system 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 Precaution for the supplemental restraint system
.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - SPIRAL CABLE) |
|
(a) Disconnect the I24 navigation receiver 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 |
|---|---|---|
|
I24-8 (SW2) - H54-5 (AU2) |
Always |
Below 1 Ω |
|
I24-6 (SWG) - H54-4 (EAU) |
||
|
I24-7 (SW1) - H54-6 (AU1) |
||
|
I24-8 (SW2) - Body ground |
Always |
10 kΩ or higher |
|
I24-6 (SWG) - Body ground |
||
|
I24-7 (SW1) - Body ground |
(d) Reconnect the spiral cable connector.
(e) Reconnect the navigation receiver assembly connector.
|
|
2. |
INSPECT SPIRAL CABLE |
|
(a) Disconnect the z12 and H54 spiral cable connectors. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H54-4 (EAU) - z12-8 (EAU) |
Spiral cable is turned 2.5 rotations counterclockwise |
Below 1 Ω |
|
Spiral cable is centered |
||
|
Spiral cable is turned 2.5 rotations clockwise |
||
|
H54-5 (AU2) - z12-9 (AU2) |
Spiral cable is turned 2.5 rotations counterclockwise |
|
|
Spiral cable is centered |
||
|
Spiral cable is turned 2.5 rotations clockwise |
||
|
H54-6 (AU1) - z12-10 (AU1) |
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 Precaution for the supplemental restraint system
.
(c) Reconnect the spiral cable connectors.
|
|
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 |
|---|---|---|
|
9 (AU2) - 8 (EAU) |
No switch is pushed |
100 kΩ or higher |
|
MODE switch pushed |
Below 1 Ω |
|
|
On Hook switch pushed |
312 to 345 Ω |
|
|
Off Hook switch pushed |
950 to 1050 Ω |
|
|
Voice switch is pushed |
2954 to 3265 Ω |
|
|
10 (AU1) - 8 (EAU) |
No switch is pushed |
100 kΩ or higher |
|
Seek+ switch pushed |
Below 1 Ω |
|
|
Seek- switch pushed |
312 to 345 Ω |
|
|
Volume+ switch is pushed |
950 to 1050 Ω |
|
|
Volume- switch is pushed |
2954 to 3265 Ω |
(c) Reconnect the steering pad switch assembly connector.
|
|
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