Spoiler not retracting

DIAGNOSIS/TROUBLESHOOTING - FAULT CODE 9150 (SPOILER NOT RETRACTING)

Work instruction			Display OK	If not OK
1	Check fuse	Check fuse D 7	Step 2	Replace fuse -> End
2	Check spoiler status	In the menu item "Input signals", select Spoiler status Spoiler completely extended	Display in PST2: Spoiler is extended Step 3	Step 13
3	Check spoiler key	In the menu item "Input signals", select Spoiler key Actuate key Retract spoiler and perform the function check	Display in PST2: Retract spoiler key actuated Step 4	Check spoiler key or check the wiring from the spoiler key to the instrument cluster. -> End
4	Check relay 9 power supply (rear relay carrier)	Switch off ignition Disconnect relay 9 Measure voltage between relay socket pin 5 and ground	Battery voltage Step 5	Short circuit to ground/ open circuit in the wiring between fuse D7 and relay 3 or from relay no. 3 to relay no. 9 Repair wiring harness. -> End
5	Check ground lead relay 9 (rear relay carrier)	Measure resistance between relay socket pin 4 and ground Measure resistance between relay socket pin 2 and ground	< 5 Step 6	Repair wiring harness -> End
6	Check control signal from instrument cluster to relay carrier	Switch on ignition Actuate key Retract spoiler and at the same time measure the voltage between connector on relay socket pin 7 and ground	Spoiler key actuated battery voltage Step 7	Step 10
7	Replace relay	Switch off ignition Replace no. 9 on rear relay carrier Switch on ignition Actuate key Retract spoiler	Spoiler not retracting ->End	Step 8
8	Check ground lead relay no. 3	Disconnect relay no. 3 from rear relay carrier Measure resistance between relay socket no.3, pin 4 and ground	< 5 Step 9	Repair wiring harness -> End
9	Check relay no. 3	Jumper pin 4 and pin 3 on relay no. 3 Relay no. 9 is plugged in Actuate spoiler key Retract spoiler	Spoiler retracting Step 16	Step 12
10	Check wire between instrument cluster and relay no. 9 for short to ground	Switch off ignition Remove connector A from the instrument cluster Measure resistance between relay socket pin 7 and ground	Step 11	Repair wiring harness -> End
11	Check wire between instrument cluster and relay no. 9 for open circuit	Measure resistance between relay socket pin 7 and connector A on the instrument cluster pin 23	< 5 Step 19	Repair wiring harness -> End
12	Check power supply of the spoiler drive	Switch off ignition Disconnect connector from the spoiler drive Insert both relays Switch on ignition Actuate key Retract spoiler and at the same time measure the voltage between connector on spoiler drive pin 2 and ground Actuate key Extend spoiler and at the same time measure the voltage between connector on spoiler drive between pin 1 and pin 2	Battery voltage Step 16	Check wiring between spoiler drive and relay no. 3 and relay no. 9.
13	Check microswitch	Disconnect plug connection X 23 Remove microswitches Actuate top microswitch by hand and at the same time measure the resistance on the plug of the microswitch (pin side) between pin 2 and pin 5 Actuate bottom microswitch by hand and at the same time measure the resistance on the plug of the microswitch (pin side) between pin 4 and pin 5	< 5 Step 14	Step 15
14	Check ground lead between ground point 8 and micro switch for open circuit	Measure resistance between plug connection X 23 pin 5 (sleeve side) and ground	< 5 Step 18	Repair wiring harness -> End
15	Replace microswitch and re-perform the function check. If not O.K., check wiring to instrument cluster.		-> End
16	Replace relay no. 9 on rear relay carrier		-> End
17	Replace spoiler drive		-> End
18	Check wiring from plug connection X 23 to instrument cluster		-> End
19	Replace instrument cluster		-> End