Inspection Procedure 2: Check the Centre Display Unit Power Supply
Circuit.
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COMMENTS ON TROUBLE SYMPTOM
The earth circuit, the ignition switch
(ACC) circuit or the ignition switch (IG1) circuit is suspected to be open or
defective.
POSSIBLE CAUSES
- Malfunction of the centre display unit
- Damaged wiring harness and connectors
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STEP 1. Check the following connector: D-106 centre display unit
connector
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Q.
Is the check result normal?
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Go to Step 2.
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Repair
the defective connector.
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STEP 2. Measure the voltage at D-106 centre display unit connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the Ignition switch to the "LOCK" (OFF)
position.
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(3)Voltage between D-106 centre display unit connector
terminal No.10 and body earth OK: System voltage
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Q.
Is the check result normal?
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Go to Step 4.
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Go to Step 3.
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STEP 3. Check the harness wire between battery (fusible link No.1) and
D-106 centre display unit connector terminal No.10.
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note |
Prior to the wiring harness inspection, check
intermediate connector D-241, and repair if necessary.
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- Check the battery power supply open circuit.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair
the wiring harness.
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STEP 4. Measure the voltage at D-106 centre display unit connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the ignition switch to the "ACC" position.
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(3)Voltage between D-106 centre display unit connector
terminal No.13 and body earth OK: System voltage
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Check the harness wire between ignition switch (ACC) and D-106
centre display unit connector terminal No.13.
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note |
Prior to the wiring harness inspection, check
intermediate connectors D-238 and D-241, and repair if
necessary.
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- Check the ACC power supply open circuit.
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Q.
Is the check result normal?
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Retest
the system.
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Repair
the wiring harness.
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STEP 6. Measure the voltage at D-106 centre display unit connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Turn the ignition switch to the "ON" position.
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(3)Voltage between D-106 centre display unit connector
terminal No.10 and body earth OK: System voltage
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 7.
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STEP 7. Check the harness wire between ignition switch (IG1) and D-106
centre display unit connector terminal No.36.
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note |
Prior to the wiring harness inspection, check
intermediate connector D-241, and repair if necessary.
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- Check the IG1 power supply open circuit.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair
the wiring harness.
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STEP 8. Measure the resistance at D-106 centre display unit connector.
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(1)Disconnect the connector, and measure at the wiring
harness side.
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(2)Resistance between D-106 centre display unit connector
terminal No.1 and body earth OK: Continuity exists (2 Ω
or less)
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Q.
Is the check result normal?
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Go to Step 10.
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Go to Step 9.
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STEP 9. Check the harness wire between D-106 centre display unit
connector terminal No.1 and body earth.
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- Check the earth wires for open circuit.
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Q.
Is the check result normal?
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Go to Step 11.
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Repair
the wiring harness.
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STEP 10. Replace the centre display unit temporarily and retest the
system.
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Check that the centre display correctly when
the centre display unit is replaced temporarily.
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Q.
Is the check result normal?
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Replace the centre display
unit.
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Go to Step 11.
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STEP 11. Retest the system.
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Check that the centre display unit
correctly.
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Q.
Is the check result normal?
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The
procedure is complete.
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Return to Step 1.
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