Pinpoint Test D: The Audio System Illumination Is Inoperative
- D1 CHECK THE VOLTAGE CIRCUITS TO THE AUDIO UNIT
- Disconnect: Audio Unit C2188a (with Navigation system) or C290a (without Navigation system).
- Turn the headlamp switch to the parking lamps ON position.
- Rotate the instrument panel dimmer switch to the full illumination position.
- Measure the voltage between the audio unit, harness side and ground. Refer to the following table for the correct vehicle/audio unit, connector, pin and circuit information.CONNECTOR-PIN SPECIFICATIONS
Vehicle/Audio Unit Connector-Pin Circuit Expedition with Navigation C2123a-4 19 (LB/RD) Navigator with Navigation C2253a-3 19 (LB/RD) Expedition with Base Audio C240a-3 19 (LB/RD) Expedition with CDX6 Audio C240a-3 19 (LB/RD) Navigator with CDX6 Audiophile C240a-3 235 (RD/BK) Navigator with CDX6 Dual Media C240a-3 235 (RD/BK) - Is the voltage greater than 10 volts?
- Yes : GO to D2.
- No : REPAIR the circuit in question. TEST the system for normal operation.
- D2 CHECK THE GROUND CIRCUITS TO THE AUDIO UNIT
- Measure the resistance between the audio unit, harness side and ground. Refer to the following table for the correct vehicle/audio unit, connector, pin and circuit information.CONNECTOR-PIN SPECIFICATIONS
Vehicle/Audio Unit Connector-Pin Circuit Expedition with Navigation C2123a-2 57 (BK) Navigator with Navigation C2253a-13 694 BK/LG) Expedition with Base Audio C240a-4 57 (BK) Expedition with CDX6 Audio C240a-4 57 (BK) Navigator with CDX6 Audiophile C240a-4 57 (BK) Navigator with CDX6 Dual Media C240a-4 57 (BK) - Is the resistance less than 5 ohms?
- Yes : SEND the audio unit to an authorized repair facility. TEST the system for normal operation after the repair.
- No : REPAIR the circuit in question. TEST the system for normal operation.
- Measure the resistance between the audio unit, harness side and ground. Refer to the following table for the correct vehicle/audio unit, connector, pin and circuit information.