For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
DEFINITION: Interior lamps dimming is inoperative.
1 | Did you perform the Interior Lamps Dimming Diagnostic System Check? | -- | Go to Step 2 | Go to Interior Lights Dimming System Check .
2 |

1. Turn on the ignition.
2. Turn the headlamp switch to the PARK position.
3. Do not disconnect the headlamp switch from its connector.
4. Use a DMM in order to measure the voltage between terminal 1 of the headlamp switch and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step 4

Go to Step 3

3 |

1. Locate an open or a high resistance in CKT RU70.
2. Repair the open or the high resistance in CKT RU70.

Did you complete the repair?

--

Go to Step 9

--

4 |

1. Disconnect the headlamp switch.
2. Use the DMM in order to measure the resistance between terminal 13 of the headlamp switch connector and a known good ground.

Does the resistance measure near the specified value?

Less than 5 ohms

Go to Step 6

Go to Step 5

5 |

1. Locate an open or a high resistance in CKT F18.
2. Repair the open or the high resistance in CKT F18.

Did you complete the repair?

--

Go to Step 9

--

6 |

1. Disconnect the headlamp switch.
2. Use the DMM in order to measure the voltage between terminal 2 of the headlamp switch connector and a known good ground.

Does the voltage measure near the specified value?

B+

Go to Step 7

Go to Step 8

7 |

1. Locate a short to B+ in all of the related circuits.
2. Repair the short to B+ in all of the related circuits.

Did you complete the repair?

--

Go to Step 9

--

8 | Replace the headlamp switch. Refer to Instrument Panel, Gauges and Console. Did you complete the repair? | -- | Go to Step 9 | --
9 |

1. Connect all connectors and components that were previously disconnected.
2. Verify that the interior lamps dim properly.

Do the interior lamps dim properly?

--

Go to Interior Lights Dimming System Check .

Go to Step 1