Toyota 4Runner: Meter Illumination does not Dim at Night
DESCRIPTION
If the dimmer switch is turned to TAIL, HEAD or AUTO, the main body ECU sends a TAIL relay signal, panel light illumination signal, panel relay signal and TAIL cancel OFF signal to the combination meter. Then the meter and accessory meter become dim.
HINT:
w/ TAIL Cancel Switch:
When the headlights are illuminated and the TAIL cancel switch is turned on, the meter does not dim.
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check for DTCs (See page .gif)
).
Result
|
Result |
Proceed to |
|---|---|
|
CAN communication system DTC is not output |
A |
|
CAN communication system DTC is output |
B |
| B | .gif) |
Go to CAN COMMUNICATION SYSTEM |
|
.gif)
|
2. |
READ VALUE USING TECHSTREAM (LIGHT CONTROL RHEOSTAT) |
(a) Operate the Techstream according to the display and select the Data List
(See page ).
Combination Meter
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Tail Cancel SW* |
TAIL cancel switch condition/ON or OFF |
on: TAIL cancel switch on off: TAIL cancel switch off |
- |
|
Rheostat value |
Light control rheostat switch input/Min.: 0, Max.: 100 |
Light control rheostat switch is fully turned downward (0) → fully turned upward (100) |
Unit: % |
- *: w/ TAIL Cancel Switch
OK:
Light brightness can be changed within specified range by manual operation.
| OK | |
REPLACE COMBINATION METER ASSEMBLY |
|
|
3. |
INSPECT LIGHT CONTROL RHEOSTAT |
w/o TAIL Cancel Switch:
(a) Inspect the light control rheostat.
.png)
(1) Remove the light control rheostat (See page
).
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
7 (T) - 1 (E) |
Always |
8 to 12 kΩ |
|
3 (RV) - 1 (E) |
Light control rheostat fully turned upward → fully turned downward |
8 to 12 kΩ → Below 50 Ω |
w/ TAIL Cancel Switch:
(b) Inspect the light control rheostat.
.png)
(1) Remove the light control rheostat (See page
).
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
7 (T) - 5 (TC) |
TAIL cancel switch off → on |
1 MΩ or higher → Below 1 Ω |
|
7 (T) - 1 (E) |
Always |
8 to 12 kΩ |
|
3 (RV) - 1 (E) |
Light control rheostat fully turned upward → fully turned downward |
8 to 12 kΩ → Below 50 Ω |
| NG | |
REPLACE LIGHT CONTROL RHEOSTAT |
|
|
4. |
CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) |
(a) Disconnect the F14 meter connector.
(b) Disconnect the F5 rheostat connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F14-37 (RHIG) - F5-7 (T) |
Always |
Below 1 Ω |
|
F14-38 (TR) - F5-3 (RV) |
||
|
F14-39 (E2) - F5-1 (E) |
||
|
F14-36 (TC) - F5-5 (TC)* |
- *: w/ TAIL Cancel Switch
| OK | |
REPLACE COMBINATION METER ASSEMBLY |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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DESCRIPTION
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