Fault code 2038: Diagnosis/troubleshooting

NOTE: Visual inspection: In the next troubleshooting section, please check first that the affected 'pins' of the transverse lock control unit plug connection and the 'pins' of the plug connections on the servo motor are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

NOTE: Control unit replacement: Before replacing the 'transverse lock control unit', the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588. Additional causes of faults that could damage the 'transverse lock control unit' should be detected and remedied.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Work instruction			Display OK	If not OK
1	Check power supply of potentiometer:	Ignition off Pull sensor plug 'B' off servo motor Ignition on Measure voltage at sensor plug 'B' (wiring harness side) between: 'pin B1 and pin B2', 'pin B5 and ground' and 'pin B7 and ground'.	Approx. 5 V Go to Step 2, measurement '2a'	Measured voltage > 5 V Go to Step 2, measurement '2b' Measured voltage < 5 V Go to Step 3
2	Check short circuit to B+:	Measurement '2a': Ignition off Pull plug 'A' off servo motor Measure resistance at servo motor plugs 'A and B' between: 'pin B1 and pins A1, A2, B10', 'pin B5 and pins A1, A2, B10' and 'pin B7 and pins A1, A2, B10'	∞ Ω Measurement '2b'	Short circuit between servo motor leads. Go to Step 4
		Measurement '2b': Ignition off Pull plug 'A' off servo motor Pull plug off transverse lock control unit Ignition on Measure voltage between 'pins 1, 29, 43' of transverse lock control unit plug and ground.	< 0.3 V Measurement '2c'	Repair wiring harness to servo motor. → End
		Measurement '2c': Ignition off Measure resistance at transverse lock plug between 'pin 1 and pins 15, 16, 21, 41, 46', 'pin 29 and pins 15, 16, 21, 41, 46' and 'pin 43 and pins 15, 16, 21, 41, 46'.	∞ Ω Go to Step 5	Repair wiring harness to servo motor. → End
3	Check short circuit to ground:	Measurement '3a': Ignition off Measure resistance between 'pins 1, 29, 43' of transverse lock control unit plug and ground.	∞ Ω Go to Step 5	Measurement '3b'
3	Check short circuit to ground:	Measurement '3b': On servo motor, pull off sensor plug 'B' and servo motor plug 'A' Measure resistance between 'pins 1,29,43' of transverse lock control unit plug and ground.	∞ Ω Go to Step 4	Repair wiring harness to servo motor. → End
4	Replace transverse lock		→ End
5	Replace transverse lock control unit		Please see above note on replacing control units! → End