Accessory Meter Does Not Illuminate

METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Accessory Meter does not Illuminate
- Accessory Meter does not Illuminate

DESCRIPTION

This circuit provides power to the accessory meter assembly.

The clock and accessory meter illuminance can be adjusted by pressing the H, M, or light adjustment switch in the heater control panel.

HINT
* The whole heater control panel should be replaced if any of the switches is malfunctioning.
* If the accessory meter assembly displays "1:00" when turn the power switch off, then to on (IG) again, the +B terminal has a malfunction.
* The maximum clock assembly margin of error is -4 to 4 seconds per day when the temperature is between -20°C (-4°F) and 60°C (140°F).

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK ACCESSORY METER ASSEMBLY

(a) Check type of accessory meter assembly malfunction.

Result:

B -- SYSTEM CHECK

C -- CHECK HARNESS AND CONNECTOR (HEATER CONTROL PANEL - ACCESSORY METER ASSEMBLY)
A -- Continue to next step.

2. INSPECT FUSE (ECU-ACC, GAUGE NO. 1, ECU-B NO. 2, ECU IG2)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG -- REPLACE FUSE
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY CIRCUIT)

(a) Disconnect the G1 connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ACCESSORY METER ASSEMBLY Removal

4. SYSTEM CHECK

(a) Confirm the symptoms.

Result:

B -- INSPECT MULTIPLEX NETWORK BODY ECU

A -- REPLACE COMBINATION METER ASSEMBLY Removal

5. INSPECT MULTIPLEX NETWORK BODY ECU

(a) Disconnect the G1 connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

NG -- CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - MAIN BODY ECU)
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the F15 connector.

(b) Disconnect the G1 connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ACCESSORY METER ASSEMBLY Removal

7. CHECK HARNESS AND CONNECTOR (ACCESSORY METER ASSEMBLY - MAIN BODY ECU)

(a) Disconnect the F14 connector.

(b) Disconnect the G1 connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ACCESSORY METER ASSEMBLY Removal

8. CHECK HARNESS AND CONNECTOR (HEATER CONTROL PANEL - ACCESSORY METER ASSEMBLY)

(a) Disconnect the G8 connector.

(b) Disconnect the G1 connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. INSPECT HEATER CONTROL PANEL

(a) Remove the heater control panel Removal.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

NG -- REPLACE HEATER CONTROL PANEL Removal

OK -- REPLACE ACCESSORY METER ASSEMBLY Removal