Inspection Procedure 2: Check the Centre Display Unit Power Supply
Circuit.
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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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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