Toyota CH-R Service Manual: Operating Light Control Rheostat does not Change Light Brightness

Toyota CH-R Service Manual / Meter / Gauge / Display / Meter / Gauge System / 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.

(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

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: %

Body Electrical > Combination Meter > Data List

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

REPLACE COMBINATION METER ASSEMBLY

2.	INSPECT LIGHT CONTROL RHEOSTAT

(a) Remove the light control rheostat

Click here

(b) Inspect the light control rheostat

Click here

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.

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

REPLACE COMBINATION METER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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