For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Radio/Audio System Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check - Radio/Audio System .
2 |

1. Turn the ignition switch to the ON position.
2. Turn the radio ON.

Does the radio display operate properly?

--

Go to Step 7

Go to Step 3

3 |

1. Disconnect the radio connector.
2. Use the DMM to measure the voltage between terminal F1 of the radio connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 5

Go to Step 4

4 |

1. Locate an open or a high resistance in circuit A52.
2. Repair the open or the high resistance in circuit A52.

Is the repair complete?

--

Go to Step 8

--

5 |

1. Use the DMM to measure the resistance between terminal E16 and a known good ground.
2. Use the DMM to measure the resistance between terminal F5 and a known good ground.

Is the measured resistance for both measurements within the specified value?

Less than 5 ohms

Go to Step 7

Go to Step 6

6 |

1. Locate an open or a high resistance in circuits F49 and/or F40.
2. Repair the open or the high resistance in circuits F49 and/or F40.

Is the repair complete?

--

Go to Step 8

--

7 | Replace the radio. Refer to Radio Replacement in Entertainment. Is the replacement complete? | -- | Go to Step 8 | --
8 |

1. Connect all connectors and components that were disconnected.
2. Verify that the radio controls operate properly.

Do the radio controls operate properly?

--

System OK

Go to Step 1