Check power supply (+30)

• Check for battery voltage between pin 1 of audio amplifier connector and earth

• Check the connector is correctly inserted in the other part.

• Try to move it from its seat by shifting it by a small amount in all directions, holding the connector case in your fingers and the wiring in your hand. The connector should remain in place

• Apply a moderate pulling force. The connector should remain in place

• check whether the power supply turns off, turns on and/or vice versa (touching/not touching)

• Subject the cable to a pulling force and check cable stability (no shrinkage): apply repeated pull-push-pull cycles to the cable and check it remains immobile.

Examine the crimping:

Use a magnifying glass to examine the terminal criming area. The barrels must be turned symmetrically and three-stranded sections should not emerge from the criming area. The area of bare wire beneath the barrel must emerge by approximately 0.5 mm

Replace fuse F61 in the boot compartment control unit if blown, after identifying the cause

• Restore the wiring between the boot compartment control unit and subwoofer

Check earth

Disconnect the amplifier connector and connect an ohmmeter accross pin 2 and earth and check the resistance is lower than 1 ohm

Check the activation signal from the radio

• With the radio on, check for the presence of a 12 Volt activation signal at pin 6 of the amplifier