CAUTIONCOMMENTS ON TROUBLE SYMPTOM
If any of the headlamps do not illuminate, the wiring harness connector(s), the bulb or
the fuse may be defective or burned out.POSSIBLE CAUSES
- Malfunction of the headlamp bulbs
- Malfunction of the high-beam indicator bulb
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. Connector check: A-42 <low-beam, RH>
and
A-35 <low-beam, LH>
headlamp connector <2000> or A-30 <low-beam,
RH>
and A-15 <low-beam, LH>
headlamp connector <2400>, A-43 <high-beam,
RH>, A-39 <high-beam, LH>
headlamp connector, or C-05 <high-beam
indicator lamp>
combination meter connector
Q: Is the check result normal?
YES:
Go to Step 2
.NO: Repair the defective connector.
Step 3. Measure the resistance at A-42 <low-beam, RH>
and
A-35 <low-beam, LH>
headlamp connector <2000> or A-30 <low-beam,
RH>
and A-15 <low-beam, LH>
headlamp connector <2400>, A-43 <high-beam,
RH>, A-39 <high-beam, LH>
headlamp connector, or C-05 <high-beam indicator
lamp>
combination meter connector.
- Disconnect the connector, and measure at the wiring harness side.
- Check the resistance between the lamp connector and body earth.
- Resistance between A-42 <low-beam, right> headlamp connector <2000> terminal No.2 and body earth
- Resistance between A-30 <low-beam, right> headlamp connector <2400> terminal No.3 and body earth
- Resistance between A-35 <low-beam, left> headlamp connector <2000> terminal No.2 and body earth
- Resistance between A-15 <low-beam, left> headlamp connector <2400> terminal No.3 and body earth
- Resistance between A-43 <high-beam, right> headlamp assembly connector terminal No.2 and body earth
- Resistance between A-39 <high-beam, left> headlamp assembly connector terminal No.2 and body earth
- Resistance between C-05 <high-beam indicator lamp> combination meter connector terminal No.8 and body earth
OK: 2 Ω
or less
Q: Is the check result normal?
YES:
Go to Step 5.NO: Go to Step 4
.Step 4. Check the wiring harness from A-42 <low-beam, RH>,
A-35 <low-beam, LH>
headlamp connector terminal No.2 <2000> or A-30 <low-beam,
RH>, A-15 <low-beam, LH>
headlamp connector terminal No.3 <2400>,
A-43 <high-beam, RH>, A-39 <high-beam, LH>
headlamp connector
terminal No.2, or C-05 <high-beam indicator lamp>
combination meter connector
terminal No.8 to body earth.
- Check the earth wires for open circuit.
Q: Is the check result normal?
YES:
The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How
to Cope with Intermittent Malfunction 
).NO: Repair the wiring harness.
Step 6. Check the wiring harness from A-42 <low-beam, RH>,
A-35 <low-beam, LH>
headlamp connector terminal No.1 <2000> or A-30 <low-beam,
RH>, A-15 <low-beam, LH>
headlamp connector terminal No.2 <2400>,
A-43 <high-beam, RH>, A-39 <high-beam, LH>
headlamp connector
terminal No.1, or C-05 <high-beam indicator lamp>
combination meter connector
terminal No.9 to A-11X front-ECU connector No.6 <low-beam>
or 10 <high-beam
and high-beam indicator lamp>.
NOTE: Prior to the wiring harness inspection, check intermediate connector C-116 <high-beam
indicator>, and repair if necessary.
- Check the output lines for open circuit.
Q: Is the check result normal?
YES:
Go to Step 7.NO: Repair the wiring harness.
Step 7. Retest the system.
Q: Is the check result normal?
The lamps illuminate normally at both high and low beams.:
The trouble can be an intermittent malfunction (Refer to GROUP 00 -
How
to Cope with Intermittent Malfunction ).When the headlamps do not illuminate: Replace the headlamp socket.
When the high-beam indicator lamp does not illuminate: Replace the combination meter.