| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Audio/Visual/Telematics | Section: Audio/Video | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM0000012CG02SX |
| Title: AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Illumination Circuit |
DESCRIPTION
Power is supplied to the radio receiver and steering pad switch illumination when the light control switch is in the TAIL or HEAD position.
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. |
CHECK ILLUMINATION |
(a) Check if the illumination for the radio receiver, steering pad switch, glove box or other parts (hazard switch, transmission control switch, etc.) come on when the light control switch is turned to the HEAD or TAIL position.
Result
|
Result |
Proceed to |
|---|---|
|
Illumination comes on for all components except steering pad switch*. |
A |
|
Illumination comes on for all components except radio receiver. |
B |
|
No illumination comes on (radio receiver, hazard switch, glove box, etc.). |
C |
|
Illumination comes on for all components except steering pad switch* and radio receiver. |
D |
HINT:
*: for 8 Speakers, there is no steering pad switch.
|
|
2. |
CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - BATTERY AND BODY GROUND) |
|
(a) Disconnect the H54 spiral cable connector. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H54-12 (IL+2) - Body ground |
Light control switch TAIL or HEAD |
11 to 14 V |
(c) Reconnect the spiral cable connector.
|
|
3. |
INSPECT STEERING PAD SWITCH ASSEMBLY |
(a) Disconnect the z12 steering pad switch assembly connector.
(b) Connect the positive (+) lead to terminal IL+2 and the negative (-) lead to terminal EAU of the steering pad switch assembly connector.
(c) Check if the illumination for the steering pad switch assembly comes on.
OK:
Illumination for the steering pad switch assembly comes on.
(d) 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 |
||
|
z12-5 (IL+2) - H54-12 (IL+2) |
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 SRS
.
(d) Reconnect the steering pad switch assembly connector.
(e) Reconnect the spiral cable connector.
|
|
5. |
CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - RADIO RECEIVER ASSEMBLY) |
|
(a) Disconnect the I3 radio 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 |
|---|---|---|
|
I3-6 (SWG) - H54-4 (EAU) |
Always |
Below 1 Ω |
|
I3-6 (SWG) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the radio receiver assembly connector.
(e) Reconnect the spiral cable connector.
|
|
7. |
CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - BATTERY AND BODY GROUND) |
|
(a) Disconnect the I1*1 or I4*2 radio receiver assembly connector. HINT:
*1: for 8 Speakers HINT: *2: for 14 Speakers |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for 8 Speakers
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
I1-10 (ILL+) - Body ground |
Light control switch TAIL or HEAD |
11 to 14 V |
for 14 Speakers
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
I4-2 (ILL+) - Body ground |
Light control switch TAIL or HEAD |
11 to 14 V |
(c) Reconnect the radio receiver assembly connector.
|
|
8. |
CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMBINATION METER) |
|
(a) Disconnect the I2*1 or I4*2 radio receiver assembly connector. HINT:
*1: for 8 Speakers HINT: *2: for 14 Speakers |
(b) Disconnect the H37 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 8 Speakers
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I2-5 (ILL-) - H37-37 (ILL-) |
Always |
Below 1 Ω |
|
I2-5 (ILL-) - Body ground |
Always |
10 kΩ or higher |
for 14 Speakers
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I4-12 (ILL-) - H37-37 (ILL-) |
Always |
Below 1 Ω |
|
I4-12 (ILL-) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the radio receiver assembly connector.
(e) Reconnect the combination meter assembly connector.
|
|
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