Inspection Procedure
1: The rear display unit does not display at all.
caution |
Whenever the rear display
unit is replaced, ensure that the communication circuit is normal.
|
COMMENTS ON TROUBLE SYMPTOM
The cause is probably a faulty rear display unit power supply circuit system.
PROBABLE CAUSES
- Damaged wiring harness or connector.
- Malfunction of rear display unit.
|
STEP 1. Voltage measurement at rear display unit connector
(ACC terminal).
|
|
(1)Disconnect the connector, and measure at the wiring harness-side connector.
|
|
(2)Turn the ignition switch to the ACC position.
|
|
(3)Voltage between rear display unit connector (ACC terminal) and the body earth OK: System voltage
|
|
Q.
Is the check result normal?
|
|
Go to Step 3.
|
|
|
|
Go to Step 2.
|
|
|
|
STEP 2. Check of short to power supply, short to earth, and open circuit
in ACC line between rear display unit connector and ETACS-ECU connector.
|
|
Q.
Is the check result normal?
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
STEP 3. Voltage measurement at rear display unit connector (+B
terminal).
|
|
(1)Disconnect the connector, and measure at the rear display unit side connector.
|
|
(2)Voltage between rear display unit connector (+B terminal) and the body
earth OK: System voltage
|
|
Q.
Is the check result normal?
|
|
Go to Step 5.
|
|
|
|
Go to Step 4.
|
|
|
|
STEP 4. Check of short to power supply, short to earth, and open circuit
in +B line between rear display unit connector and ETACS-ECU connector.
|
|
Q.
Is the check result normal?
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
STEP 5. Resistance measurement at rear display unit connector (GND
terminal)
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(2)Measure the resistance between rear display unit connector (GND terminal) and the
body earth. OK: Continuity exists (2 Ω or less)
|
|
Q.
Is the check result normal?
|
|
Go to Step 7.
|
|
|
|
Go to Step 6.
|
|
|
|
STEP 6. Check of open circuit in GND line between rear display unit
connector and earth joint connector.
|
|
Q.
Is the check result normal?
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
STEP 7. Retest the system
|
|
Check if the rear display unit displays normally.
|
|
Q.
Is the check result normal?
|
|
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to use Troubleshooting/inspection Service Points - How to Cope with Intermittent
Malfunction ).
|
|
|
|
Replace the rear display unit.
|
|
|