WIS Document: 17530

| | Fault diagnosis, no bass sound (loudspeakers in doors) Fault symptom No bass sound (loudspeakers in doors) Diagnostic procedure | 1. | Check that the DIN cable is connected to the extra amplifier and the radio. | 2. | Check that the extra amplifier's connector is plugged in and that battery voltage (+30) is present on pin 2 of the connector. | 3. | Check the grounding point by taking a resistance reading across pin 1 of the 2- pin connector and a good grounding point. The resistance should be < 1 ohm. | 4. | Check that the loudspeaker connectors are plugged in. | 5. | Check the wiring between the loudspeakers and the amplifier. The resistance should be < 1 ohm. | Loudspeakers | Amplifier connection | Connection on loudspeaker | LH door + | 7 | 2 | LH door - | 8 | 1 | RH door + | 1 | 2 | RH door - | 2 | 1 | 6. | Check the speaker coils by taking a resistance reading across the connecting pins of the speakers. For test readings, see . | 7. | Check the wiring between the amplifier and radio. | 8. | Continue on .