Inspect the headlamps and the exterior lamps.

Are the headlamps and the exterior lamps working?

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Go to Step 3

Go to Step 2

Repair the headlamps and exterior lamp systems before continuing with this diagnostic table.

Is the repair complete?

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Go to Step 3

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1. Disconnect the connectors at the rear fog lamps.
2. Use an ohmmeter to measure the resistance between ground and the BK wire at the rear fog lamps.

Is the ohmmeter equal to the specified value?

0 ohms

Go to Step 5

Go to Step 4

Repair the open ground circuit for the rear fog lamps.

Is the repair complete?

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System OK

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1. With the rear fog lamps disconnected, turn the rear fog lamps to the ON position.
2. Turn ON the headlamps.
3. Inspect the voltage at the L-BU/RD wire at the rear fog lamp connectors.

Is the voltage within the specified value?

11-14 V

Go to Step 6

Go to Step 7

Replace the rear fog lamp bulbs.

Is the repair complete?

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System OK

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1. Temporarily substitute the exterior illumination relay, taillamp relay, in place of the rear fog lamp relay.
2. Turn ON the headlamps.
3. Turn the rear fog lamp switch to the ON position.

Do the rear fog lamps work with the substituted relay?

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Go to Step 8

Go to Step 9

1. Return the substituted relay to its original position.
2. Replace the rear fog lamp relay.

Is the repair complete?

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System OK

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1. Return the substituted relay to its original position, but do not reinstall the rear fog lamp relay at this time.
2. Use a voltmeter to probe each of the four terminals in the rear fog lamp relay socket.

Is one of the four terminals in the relay socket within the specified value?

11-14 V

Go to Step 11

Go to Step 10

Repair the open circuit between fuse F17 and terminal 30 of the rear fog lamp relay.

Is the repair complete?

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System OK

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1. Turn ON the headlamps.
2. Turn the rear fog lamp switch to the ON position.
3. Probe the rear fog lamp relay socket with the voltmeter.

Besides the terminal which indicated battery voltage in Step 13, does another terminal in the relay socket, relay coil positive terminal, now within the specified value?

11-14 V

Go to Step 17

Go to Step 12

1. Turn ON the headlamps.
2. Inspect the voltage at terminal 5 of the rear fog lamp switch.

Is the voltmeter within the specified value?

11-14 V

Go to Step 14

Go to Step 13

Repair the open circuit between the headlamp relay and the rear fog lamp switch.

Is the repair complete?

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System OK

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1. With the rear fog lamp switch disconnected, connect an ohmmeter between terminals 1 and 5 of the rear fog lamp switch.
2. Turn the front fog lamp switch to the ON position.

Is the ohmmeter equal to the specified value?

0 ohms

Go to Step 15

Go to Step 16

Replace the rear fog lamp switch.

Is the repair complete?

--

System OK

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Repair the open circuit between terminal 4 of the rear fog lamp switch and terminal 85 of the rear fog lamp relay.

Is the repair complete?

--

System OK

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Inspect the resistance between ground and the ground terminal at the rear fog lamp relay socket. The ground terminal at the relay socket is diagonally opposite from the relay coil positive terminal which was identified in Step 17.

Is the ohmmeter equal to the specified value?

0 ohms

Go to Step 19

Go to Step 18

Repair the ground circuit for the rear fog lamp relay.

Is the repair complete?

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System OK

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Repair the open circuit between the rear fog lamp relay and the rear fog lamps.

Is the repair complete?

--

System OK

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