Toyota CH-R Service Manual: Operating Light Control Rheostat does not Change Light Brightness
DESCRIPTION
The illumination intensity of the combination meter is increased by turning the knob of the light control rheostat upward, and decreased by turning the knob downward.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (LIGHT CONTROL RHEOSTAT) |
(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 / Combination Meter / Data List.
(e) Read the Data List according to the display on the Techstream.
(1) Combination Meter.
Body Electrical > Combination Meter > Data List|
Tester Display |
Measurement Item |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Tail Cancel SW |
Tail cancel switch/ OFF or ON |
OFF: Tail cancel switch off ON: Tail cancel switch on |
- |
|
Rheostat value |
Rheostat value/ Min.: 0 Max.: 100 |
Light control rheostat switch is Dark (0) → Bright (100) |
Unit: % |
|
Tester Display |
|---|
|
Tail Cancel SW |
|
Rheostat value |
|
Result |
Proceed to |
|---|---|
|
The Data List values of ECUs match. |
A |
|
The Data List values of ECUs do not match. |
B |
| A | .gif) |
REPLACE COMBINATION METER ASSEMBLY |
|
.gif)
|
2. |
INSPECT LIGHT CONTROL RHEOSTAT |
(a) Remove the light control rheostat
Click here .gif)
(b) Inspect the light control rheostat
Click here
| NG | |
REPLACE LIGHT CONTROL RHEOSTAT |
|
|
3. |
CHECK HARNESS AND CONNECTOR (LIGHT CONTROL RHEOSTAT - COMBINATION METER ASSEMBLY) |
(a) Disconnect the F4 combination meter assembly connector.
(b) Disconnect the F128 light control rheostat connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F4-25 (SW1) - F128-7 (T) |
Always |
Below 1 Ω |
|
F4-26 (SW2) - F128-3 (RV) |
Always |
Below 1 Ω |
|
F4-20 (SW3) - F128-1 (E) |
Always |
Below 1 Ω |
|
F4-24 (TC) - F128-5 (TC) |
Always |
Below 1 Ω |
Standard Resistance (Check for Short):
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F4-24 (TC) - Body ground |
Always |
10 kΩ or higher |
|
F4-25 (SW1) - Body ground |
Always |
10 kΩ or higher |
|
F4-26 (SW2) - Body ground |
Always |
10 kΩ or higher |
| OK | |
REPLACE COMBINATION METER ASSEMBLY |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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PROCEDURE
1. INSPECT GLOVE BOX LIGHT ASSEMBLY
(a) Check that the LED illuminates.
(1) Apply battery voltage to the glove box light assembly and check that
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OK:
Measurement Condition
Specified Condition
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Toyota C-HR (AX20) 2023-2026 Owner's Manual
Toyota CH-R Owners Manual
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