| 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: RM0000011EZ03NX |
| Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Illumination Circuit |
DESCRIPTION
Power is supplied to the illumination circuit for the navigation receiver and steering pad switch assembly 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 Precaution for the supplemental restraint system
.
PROCEDURE
|
1. |
CHECK ILLUMINATION |
(a) Check if the illumination for the navigation receiver assembly, steering pad switch assembly, glove box light or other parts (seat heater switch, room light 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 navigation receiver. |
B |
|
No illumination (navigation receiver, glove box light, room light switch, etc.) comes on. |
C |
|
Illumination comes on for all components except steering pad switch and navigation receiver. |
D |
|
|
2. |
CHECK HARNESS AND CONNECTOR (SPIRAL CABLE - NAVIGATION RECEIVER - BATTERY AND BODY GROUND) |
|
(a) Disconnect the H54 spiral cable connector. |
(b) Disconnect the I24 navigation receiver assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H54-4 (EAU) - I24-6 (SWG) |
Always |
Below 1 Ω |
|
H54-4 (EAU) - Body ground |
Always |
10 kΩ or higher |
(d) 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 OFF |
Below 1 V |
|
Light control switch TAIL or HEAD |
11 to 14 V |
(e) Reconnect the spiral cable connector.
(f) Reconnect the navigation receiver assembly connector.
|
|
3. |
INSPECT STEERING PAD SWITCH ASSEMBLY |
(a) Disconnect the z12 steering pad switch assembly connector.
(b) Connect the positive (+) lead to terminal 5 (IL+2) and the negative (-) lead to terminal 8 (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 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 |
|---|---|---|
|
z12-5 (IL+2) - H54-12 (IL+2) |
Spiral cable is turned 2.5 rotations counterclockwise |
Below 1 Ω |
|
Spiral cable is centered |
||
|
Spiral cable is turned 2.5 rotations clockwise |
||
|
z12-8 (EAU) - H54-4 (EAU) |
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.
|
|
5. |
CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - BATTERY AND BODY GROUND) |
|
(a) Disconnect the I20 navigation receiver assembly connector. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
I20-2 (ILL+) - Body ground |
Light control switch TAIL or HEAD |
11 to 14 V |
|
Light control switch OFF |
Below 1 Ω |
(c) Reconnect the navigation receiver assembly connector.
|
|
6. |
CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - COMBINATION METER) |
|
(a) Disconnect the I20 navigation receiver assembly connector. |
(b) Disconnect the H37 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I20-12 (ILL-) - H37-37 (ILL-) |
Always |
Below 1 Ω |
|
I20-12 (ILL-) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the navigation receiver assembly connector.
(e) Reconnect the combination meter assembly connector.
|
|
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