Spoiler does not extend: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING FAULT CODE 9150 (SPOILER DOES NOT EXTEND)

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 retracted	Display in Porsche System Tester II 9588: "Spoiler is retracted"	Step 13
3	Check spoiler button	In menu item "Input signals", select "Spoiler button" Actuate "Extend spoiler" button and perform the function check	Display in Porsche System Tester II 9588: "Extend spoiler" button actuated"	Check spoiler button or check the wiring from the spoiler button to the instrument cluster ->End
4	Check relay 3 voltage supply (rear relay carrier)	Switch off ignition Disconnect relay 3 Measure voltage between relay socket pin 5 and ground	Battery positive voltage Step 5	Short circuit to ground / open circuit in the wire between fuse D 7 and relay 3. Repair wiring harness. ->End
5	Check relay 3 ground lead (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 "Extend spoiler" button and at the same time measure the voltage between relay socket pin 7 and ground	"Extend spoiler" button actuated Battery positive voltage Step 7	Step 10
7	Replace relay	Switch off ignition Replace relay No. 3 on rear relay carrier Switch on ignition Actuate "Extend spoiler" button	Spoiler extends ->End	Step 8
8	Check relay No. 9 ground lead	Pull off relay No. 9 on rear relay carrier Measure resistance between relay socket No.9, pin 4 and ground	< 5 Step 9	Repair wiring harness ->End
9	Check relay No. 9	Jumper pin 4 and pin 3 on relay no. 9 Relay no. 3 is plugged in Actuate "Extend spoiler" button	Spoiler extends Step 16	Step 12
10	Check wire between instrument cluster and relay No. 3 for short to ground	Switch off ignition Remove plug 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 3 for open circuit	Measure resistance between relay socket pin 7 and plug A on the instrument cluster pin 7	< 5 Step 19	Repair wiring harness ->End
12	Check power supply of the spoiler drive	Switch off ignition Insert relay No. 9 Disconnect plug from the spoiler drive Switch on ignition Actuate "Extend spoiler" button and at the same time measure the voltage between plug X 23 on spoiler drive pin 1 and ground Actuate "Retract spoiler" button and at the same time measure the voltage on plug X 23 of spoiler drive between pin 1 and pin 3	Battery positive voltage Step 17	Check wiring between spoiler drive, relay No. 3 and relay No. 9. ->End
13	Check micro switches	Disconnect plug connection X 23 Remove micro switches Actuate top micro switch by hand and at the same time measure the resistance on the plug of the micro switch (pin side) between pin 2 and pin 5 Actuate bottom micro switch by hand and at the same time measure the resistance on the plug of the micro switch (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 micro switch and repeat the function check. If not OK, 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