Heads Up Display Unit: Testing and Inspection

METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Headup Display Malfunction
- Headup Display Malfunction

DESCRIPTION

This circuit is the power source circuit for the headup display (combination meter mirror ECU).

WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
Before starting the following inspection, confirm the headup display (combination meter mirror ECU) position and illuminance, then perform the on-vehicle inspection On-Vehicle Inspection.

PROCEDURE

1. SYSTEM CHECK

(a) Check the symptom of the headup display (combination meter mirror ECU).

Result:





B -- READ VALUE USING TECHSTREAM
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (HEADUP DISPLAY CIRCUIT)

(a) Disconnect the L139 connector.





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

Standard Voltage:





(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 HEADUP DISPLAY (COMBINATION METER MIRROR ECU) Disassembly

3. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream ON.

(d) Enter the following menus: Body Electrical / Combination Meter / Data List.

(e) Check the values by referring to the table below.

Combination Meter





OK:

Each switch condition displayed on the Techstream changes with the actual switch operation.

B -- CHECK HARNESS AND CONNECTOR (HEADUP DISPLAY - NO. 3 METER CIRCUIT PLATE)

A -- REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE) Disassembly

4. CHECK HARNESS AND CONNECTOR (HEADUP DISPLAY - NO. 3 METER CIRCUIT PLATE)

(a) Disconnect the L139 and L57 connectors.

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

Standard Resistance:





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

5. INSPECT TRIP SWITCH

(a) Disconnect the L57 connector.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE TRIP SWITCH Removal
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (TRIP SWITCH - NO. 3 METER CIRCUIT PLATE)

(a) Disconnect the L27, L57, and L137 connectors.

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

Standard Resistance:





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

7. REPLACE HEADUP DISPLAY (COMBINATION METER MIRROR ECU)

(a) Replace the headup display (combination meter mirror ECU) with a new or a known good one Disassembly.

OK:

The operation of the headup display (combination meter mirror ECU) returns to normal.

NG -- REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE) Disassembly

OK -- END