| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Vehicle Exterior | Section: Lighting (ext) | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002WKS005X |
| Title: LIGHTING (EXT): LIGHTING SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Light Control Switch Circuit |
DESCRIPTION
The main body ECU receives light control switch, dimmer switch and front fog light switch information signals from the headlight dimmer switch.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (HEADLIGHT DIMMER SWITCH) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Data List /
(e) According to the display on the Techstream, read the Data List.
Main Body
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Dimmer SW |
Dimmer switch signal / ON or OFF |
ON: Dimmer switch ON OFF: Dimmer switch OFF |
- |
|
Passing Light SW |
Passing light switch signal / ON or OFF |
ON: Passing light switch ON OFF: Passing light switch OFF |
- |
|
Front Fog Light SW |
Front fog light switch signal / ON or OFF |
ON: Front fog light switch ON OFF: Front fog light switch OFF |
- |
|
Auto Light SW |
Auto light switch signal / ON or OFF |
ON: Auto light switch ON OFF: Auto light switch OFF |
- |
|
Head Light SW (Head) |
Headlight switch signal / ON or OFF |
ON: Headlight switch ON OFF: Headlight switch OFF |
- |
|
Head Light SW (Tail) |
Taillight switch signal / ON or OFF |
ON: Taillight switch ON OFF: Taillight switch OFF |
- |
OK:
When combination light switch operation is performed, the result will be the same as above.
|
|
3. |
INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY |
|
(a) Remove the headlight dimmer switch assembly
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
18 (T) - 12 (EL) |
Light control switch TAIL |
Below 1 Ω |
|
Light control switch HEAD |
Below 1 Ω |
|
|
20 (H) - 12 (EL) |
Light control switch HEAD |
Below 1 Ω |
|
19 (A) - 12 (EL) |
Light control switch AUTO |
Below 1 Ω |
|
4 (BFG) - 3 (LFG) |
Front fog light switch ON |
Below 1 Ω |
|
17 (HF) - 12 (EL) |
Dimmer switch High |
Below 1 Ω |
|
11 (HU) - 12 (EL) |
Dimmer switch Low |
Below 1 Ω |
(c) Reinstall the headlight dimmer switch assembly.
|
|
5. |
CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - MAIN BODY ECU) |
|
(a) Disconnect the H11 headlight dimmer switch assembly connector. |
(b) Disconnect the H3, H4 and DD main body ECU connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H11-4 (BFG) - H3-28 (FFOG) |
Always |
Below 1 Ω |
|
H11-19 (A) - H4-21 (A) |
Always |
Below 1 Ω |
|
H11-20 (H) - H3-17 (HEAD) |
Always |
Below 1 Ω |
|
H11-18 (T) - H4-23 (TAIL) |
Always |
Below 1 Ω |
|
H11-17 (HF) - H4-13 (HF) |
Always |
Below 1 Ω |
|
H11-11 (HU) - DD-13 (HU) |
Always |
Below 1 Ω |
|
H11-4 (BFG) - Body ground |
Always |
10 kΩ or higher |
|
H11-19 (A) - Body ground |
Always |
10 kΩ or higher |
|
H11-20 (H) - Body ground |
Always |
10 kΩ or higher |
|
H11-18 (T) - Body ground |
Always |
10 kΩ or higher |
|
H11-17 (HF) - Body ground |
Always |
10 kΩ or higher |
|
H11-11 (HU) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the main body ECU connectors.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H11-12 (EL) - Body ground |
Always |
Below 1 Ω |
|
H11-3 (LFG) - Body ground |
Always |
Below 1 Ω |
(f) Reconnect the headlight dimmer switch assembly connector.
|
|
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