For 1990-2009 cars

### Diagnostic Aids

If there are several other systems inoperative with the ignition ON, such as power windows, power seats, sunroof, and front turn signals, check ground G101.

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
1 | Inspect fuses F12, EF16, EF14, EF10 and EF13. Are any fuses open? | -- | Go to Step 2 | Go to Step 3
2 |

1. Inspect for a short circuit and repair it, if necessary.
2. Replace the open fuse.

Is the repair complete?

--

System OK

--

3 | Use a voltmeter to measure the voltage at F12. Does the voltage measure within the specified range? | 11-14 V | Go to Step 5 | Go to Step 4
4 | Repair the open power supply circuit to fuse EF12. Is the repair complete? | -- | System OK | --
5 | Turn the headlamps ON. Are the parking lamps, tail lamps, and license lamps working? | -- | Go to Step 6 | Go to Step 8
6 | Temporarily substitute the illumination relay in place of the headlamp relay. Do the headlamps operate with the substituted relay? | -- | Go to Step 7 | Go to Step 8
7 |

1. Reinstall the illumination relay in its original position.
2. Replace the headlamp relay.

Is the repair complete?

--

System OK

--

8 |

1. Disconnect the headlamp connectors, and use an ohmmeter to check continuity between terminal B and ground. Repeat this procedure on the other side.
2. Connect the headlamp connectors.

Does the ohmmeter indicate the specified value between each terminal and ground?

0 ohms

Go to Step 10

Go to Step 9

9 | Repair the open circuit between the headlamps and ground. Is the repair complete? | -- | System OK | --
10 |

1. Disconnect light switch connector.
2. Turn the headlamps ON.
3. Using a voltmeter, measure voltage at light switch connector terminal 3, harness side.

Is the voltage within the specified range?

11-14 V

Go to Step 12

Go to Step 11

11 | Repair the open circuit between the light relay and the light switch. Is the repair complete? | -- | System OK | --
12 | Use an ohmmeter to check continuity between light switch connector, terminal 2 harness side, and ground. Did the ohmmeter indicate the specified value? | 0 ohms | Go to Step 14 | Go to Step 13
13 | Repair the open circuit between light switch connector and ground. Is the repair complete? | -- | System OK | --
14 | Replace the light switch. Is the repair complete? | -- | System OK | --