Fault code 1516: Diagnosis/troubleshooting

NOTE: Visual inspection: In the next troubleshooting section, please check first that the affected pins on the rear convenience system control unit plug connection are neither damaged nor corroded. The wiring and plugs of the affected components must also be checked for external damage and proper contact. Repair damaged or corroded pins if possible, otherwise replace affected pins. Repair or replace damaged wires.

NOTE: Sporadic faults: In the event of faults that occur sporadically, the wiring positions that are linked to moving parts on and in the vehicle must be checked for each system. Various statuses that can cause faults must be simulated with the help of the wiring diagram.

NOTE: Battery voltage: A battery voltage of between 11.4 and 14.5 V is required for the following troubleshooting procedure. This must be checked and provided, if necessary. On the vehicle electrical system, the voltage to the fuse (input side) must be guaranteed.

WORK INSTRUCTION CHART

Work instruction			Display OK	If not OK
1	Check fuse	Check fuse in right fuse carrier (F14, [20 A]) for continuity	Go to step 2	Replace fuse and remedy the cause, if necessary The following outputs on the control unit are powered via fuse F15 in left fuse carrier: B10 Rear fog light C10 Left brake light
2	Check voltage supply at fuse	Check voltage at fuse (F15 [20 A]) in fuse carrier at right of dashboard	11.4 to 14.5 V Go to step 3	Continue troubleshooting with wiring diagram → End
4	Check voltage supply at rear convenience system control unit	Switch off ignition Pull off plug C on rear convenience system control unit Measure voltage between control unit plug C, pin 9 and ground	11.4 to 14.5 V Go to step 5	Repair line → End
5	Replace rear convenience system control unit		→ End