For 1990-2009 cars

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
1 | Inspect the stop lamps. Do the stop lamps work? | -- | Go to Step 3 | Go to Step 2
2 | Repair the stop lamps before completing this diagnostic table. Does the center high-mounted stop lamp (CHMSL) work after the stop lamps have been repaired? | -- | System OK | Go to Step 3
3 |

1. Remove the CHMSL lamp bulb.
2. Visually and physically check the CHMSL lamp bulb.

Is the lamp bulb defective?

--

Go to Step 4

Go to Step 5

4 | Replace the CHMSL lamp bulb. Did you complete the replacement? | -- | System OK | --
5 |

1. Disconnect the CHMSL connector.
2. Use an ohmmeter to measure the resistance between ground and the BK wire in the CHMSL connector.

Is the resistance equal to the specified value?

0 ohms

Go to Step 7

Go to Step 6

6 | Repair the open circuit between ground and the BK wire in the CHMSL connector. Did you complete the repair? | -- | System OK | --
7 | Repair the open circuit between the stop lamp switch and the CHMSL. Did you complete the repair? | -- | System OK | --