DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK CAN COMMUNICATION SYSTEM
READ VALUE USING INTELLIGENT TESTER (LIGHT CONTROL RHEOSTAT)
INSPECT LIGHT CONTROL RHEOSTAT
CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT)
METER / GAUGE SYSTEM - Meter Illumination does not Dim at Night
DESCRIPTION
w/ Multi-information Display:
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 switch off signal to the combination meter. Then the meter and accessory meter become dim.
- TAIL cancel switch: When the headlights are illuminated and the TAIL cancel switch is turned on, the meter does not dim.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK CAN COMMUNICATION SYSTEM |
Check for DTCs ().
Result| Result | Proceed to |
| CAN communication system DTC is not output | A |
| CAN communication system (for LHD) DTC is output | B |
| CAN communication system (for RHD) DTC is output | C |
| | Go to CAN COMMUNICATION SYSTEM ()
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| | Go to CAN COMMUNICATION SYSTEM ()
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| 2.READ VALUE USING INTELLIGENT TESTER (LIGHT CONTROL RHEOSTAT) |
Operate the intelligent tester according to the display and select Data List ().
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 right (0) → fully turned left (100) | Unit: % |
- OK:
- Light brightness can be changed within specified range by manual operation.
| OK | |
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| REPLACE COMBINATION METER ASSEMBLY ()
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| 3.INSPECT LIGHT CONTROL RHEOSTAT |
Inspect the light control rheostat.
Remove the light control rheostat ().
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| 6 (TC) - 1 (E) | TAIL cancel switch off → on | 10 kΩ or higher → Below 1 Ω |
| 5 (T) - 1 (E) | Always | 10 kΩ or higher |
| 7 (TR) - 1 (E) | Light control rheostat fully turned right → fully turned left | 10 kΩ or higher → Below 100 Ω |
Inspect the trip switch.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Switch Condition | Specified Condition |
| 4 (A/B) - 1 (E) | TRIP switch on (Pushed) | Below 200 Ω |
| TRIP switch off (Not Pushed) | 1 MΩ or higher |
| | REPLACE LIGHT CONTROL RHEOSTAT ()
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| 4.CHECK HARNESS AND CONNECTOR (COMBINATION METER - LIGHT CONTROL RHEOSTAT) |
Disconnect the E8 meter connector.
Disconnect the E9 rheostat connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| E8-18 (ILL+) - E9-5 (T) | Always | Below 1 Ω |
| E8-19 (TR) - E9-7 (TR) |
| E8-23 (E2) - E9-1 (E) |
| E8-20 (TC) - E9-6 (TC) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| REPLACE COMBINATION METER ASSEMBLY ()
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