Switch short circuit to ground: Diagnosis/troubleshooting

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSIS/TROUBLESHOOTING FOR FAULT CODE 2

Work instruction			Display OK	If not OK
1	Check input signals for convertible top switch	Ignition on Connect Porsche System Tester II 9588 and call up the Input signals menu Check position of convertible-top button	Convertible-top button not actuated is displayed (both input signals indicate open) Step 2	Input signal indicates "open convertible top" button actuated (input signal indicates upward and closed) Step 4 Input signal indicates "close convertible top" button actuated (input signal indicates downward and closed) Step 6
2	Check input signal open on convertible top control unit using alarm system control unit	Ignition off Pull off plugs A and B on convertible top control unit Measure voltage between plug A pin 2 and plug B pin 4 (terminal 30) Operate remote control for opening convertible top and release Insert vehicle key in lock barrel on the driver's side Use the key to turn the lock barrel to "open", hold approximately 2 seconds and release	Remote control not operated or lock barrel not turned < 0.3V Remote control activated to "open" or lock cylinder turned to "open" approx. 9 V to 10 V Step 3	Step 9
3	Check input signal close on convertible top control unit using alarm system control unit	Ignition off Measure voltage between plug A pin 15 and plug B pin 4 (terminal 30) Use the key to turn the lock barrel to "close", hold approximately 2 seconds and release Remove vehicle key from lock barrel on the driver's side Operate remote control for closing convertible top and release	Remote control not operated or lock barrel not turned < 0.3V Remote control activated to "open" or lock cylinder turned to "open" >11 V Step 13	Step 9
4	Check convertible top switch input signal open on convertible top control unit	Ignition off Pull off plug A on convertible top control unit Measure the resistance between plug A pin 1 and ground Operate convertible top switch open and release	Convertible top switch open actuated < 5 Convertible top switch open not actuated Step 13	Step 5
5	Check wire between convertible top switch open and convertible top control unit for short circuit to ground	Ignition off Pull off plug on convertible top switch Measure resistance between plug A pin 1 and switch plug pin 2	< 5 Step 8	Repair wiring harness ->End
6	Check convertible top switch input signal close on convertible top control unit	Ignition off Pull off plug A on convertible top control unit Measure the resistance between plug A pin 1 and ground Operate convertible top switch open and release	Convertible top switch open actuated < 5 Convertible top switch open not actuated Step 13	Step 7
7	Check wire between convertible top switch close and convertible top control unit for short circuit to ground	Ignition off Pull off plug on convertible top switch Measure resistance between plug A pin 1 and switch plug pin 2	< 5 Step 8	Repair wiring harness ->End
8	Check wires between convertible top switch and convertible top control unit for short circuit	Ignition off Measure resistance between plug A pin 1 and pin 14	Step 11	Repair wiring harness ->End
9	Check wires between alarm for motor and convertible top control unit for short circuit to ground	Ignition off Pull off plug A on alarm system control unit Measure resistance between convertible top control unit plug A pin 2 and ground Measure resistance between convertible top control unit plug A pin 15 and ground	Step 10	Repair wiring harness ->End
10	Check wires between alarm system control unit and convertible top control unit for short circuit	Ignition off Measure the resistance between convertible top control unit plug A pin 2 and pin 15	Step 12	Repair wiring harness ->End
11	Replace convertible top switch		->End
12	Incorrect signals from alarm system control unit		See alarm system diagnosis
13	Replace convertible top control unit		->End