A8 Quattro Sedan V8-4.2L (ABZ) (1998)
Trunk / Liftgate Lock: Diagnostic Aids
Malfunction, Steering Column & Headrest Adjustment, Driver's
Troubleshooting Procedure For Malfunction of Power Steering Column and Headrest Adjustment, Drive's Side with memory
Requirements
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Fuse No. 9 OK
^
Applicable wiring diagram available
Test Equipment
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Multimeter Fluke 83 (or equivalent)
1. Control modules, locations:
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Control module for steering column-belt height adjustment -J352-: under driver's seat on floorpan.
2. Measurements at Control module for steering column-belt height adjustment -J352- harness connector
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Disconnect 25 pin harness connector from control module
-
Using Fluke 83, check control module harness harness connector
Terminal
13: 31
Ground
Terminal
11: 30
Battery voltage
Terminal
12: 30
Battery voltage
Terminal
6:
86s Battery voltage, ignition switch 1/8 turn
Terminal
7:
30
Voltage between 1V and approx. 12V when memory button is pressed
Terminal
10: 30
Battery voltage, "ON/OFF' button pressed
3. Checking switch for steering column height adjustment
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25 pin harness connector from control module disconnected
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Operate switch as specified below
-
Using Fluke 83, check control module harness harness connector
Terminal
8:
31
Ground when switch set to "entry assistance"
Terminal
14: 31
Ground when switch set to "out", then Battery
voltage
Terminal
15: 31
Ground when switch set to "in", then Battery
voltage
Terminal
18: 31
Ground when switch set to "tilt down", then Battery voltage
Terminal
19: 31
Ground when switch set to "tilt up", then Battery voltage
NOTE: Check switch power and ground supply for steering column height adjustment using wiring diagram
4. Checking switch for belt height adjustment, driver's side
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25 pin harness connector from control module disconnected
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Operate switch as specified below
-
Using Fluke 83, check control module harness harness connector
Terminal
22: 31
Ground when switch set to "up", then
-
Battery voltage
Terminal
23: 31
Ground when switch set to "down", then Battery voltage
NOTE: Check switch power and ground supply for belt height adjustment using wiring diagram
5. Corrective measures
If all specified values are obtained, carry out the following steps in sequence:
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Check wiring harnesses for possible open/short circuit using wiring diagram (check continuity between control modules, switches and servo
motors).
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Confirm function
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If inoperative, replace control module for steering column-belt height adjustment -J352-
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Confirm function
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If inoperative, servo motors can only be replaced by replacement of complete steering column assembly
NOTE: Check wire harness routing in area of adjustable steering column. Harnesses must not be pinched, twisted or routed under tension.