Symptom Related Diagnostic Procedures
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). This circuit provides two types of power sources; one is a constant power source mainly used as a backup power source, and the other is a power source mainly used for signal transmission.
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 -- SYSTEM CHECK
A -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (HEADUP DISPLAY CIRCUIT)
(a) Disconnect the F118 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 -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (HEADUP DISPLAY - HEADUP DISPLAY SWITCH ASSEMBLY)
(a) Disconnect the F117 and F118 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.
4. INSPECT HEADUP DISPLAY SWITCH ASSEMBLY
(a) Disconnect the F117 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE HEADUP DISPLAY SWITCH ASSEMBLY Removal
OK -- REPLACE HEADUP DISPLAY (COMBINATION METER MIRROR ECU) Removal
5. SYSTEM CHECK
(a) Check the symptom of the headup display (combination meter mirror ECU).
Result:
B -- CONFIRM DTC OUTPUT
A -- Continue to next step.
6. CONFIRM DTC OUTPUT
(a) Check for DTCs On-Vehicle Inspection.
Result:
B -- REPLACE HEADUP DISPLAY (COMBINATION METER MIRROR ECU)
A -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADUP DISPLAY)
(a) Disconnect the F4 and F118 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.
8. REPLACE HEADUP DISPLAY (COMBINATION METER MIRROR ECU)
(a) Replace the headup display (combination meter mirror ECU) with a new or a known good one Removal.
OK:
The operation of the headup display (combination meter mirror ECU) returns to normal.
NG -- REPLACE COMBINATION METER ASSEMBLY Removal
OK -- END
9. CONFIRM DTC OUTPUT
(a) Check for DTCs On-Vehicle Inspection.
Result:
B -- REPLACE COMBINATION METER ASSEMBLY
A -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - HEADUP DISPLAY)
(a) Disconnect the F4 and F118 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.
11. REPLACE COMBINATION METER ASSEMBLY
(a) Replace the combination meter assembly with a new or a known good one Removal.
OK:
The operation of the headup display (combination meter mirror ECU) returns to normal.
NG -- REPLACE HEADUP DISPLAY (COMBINATION METER MIRROR ECU)
OK -- END
12. REPLACE HEADUP DISPLAY (COMBINATION METER MIRROR ECU)
(a) Replace the headup display (combination meter mirror ECU) with a new or a known good one Removal.
OK:
The operation of the headup display (combination meter mirror ECU) returns to normal.
NG -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal
OK -- END