Check power supply (+30)

- Check for battery voltage across pin 3 of the subwoofer connector and earth

- Check that the connector is correctly inserted in its other part

- Try to move it from its seat by making small movements in all directions, grasping the connector body in your fingers and the wiring in your hand. The connector must stay in place

- Exercise a moderate pulling force. The connector must stay in place

- Check whether the power supply goes off, on and/or viceversa (touching/not touching)

- Pull the lead and check the stability in the groove (should not move back): exercise repeated pull-push-pull cycles on the cable and check it remains immobile

Examine the crimping.

Use a lens to examine the terminal crimping area. The barrels must be turned symmetrically and no strands should emerge from the crimped area. The bare wire section under the barrels must emerge by 0.5.

Restore correct power supply

See E3510 RADIO

Check the earth

Disconnect the subwoofer connector and connect an ohmmeter accross pin 7 and earth and check the resistance is lower than 1 ohm

Check the ignition signal

With the radio on, check for a 12 Volt signal at pin 8 of the subwoofer connector

Restore the connection between the subwoofer and audio amplifier

See E3510 RADIO

If the wiring is OK, continue to step 4 and replace the radio if the radio output power supply is interrupted

Check the subwoofer enablement signal

With the radio on, check for a 12 Volt signal at pin 6 of radio connector C

Replace the radio

Op. 5570T80 CAR RADIO EQUIPMENT - R+R