Quick answer
If your horn or cruise goes odd right after a wheel-off service, the clock spring ribbon was usually over-spun, or you left a plug loose. Mark straight-ahead before you remove the wheel, never freewheel the hub with the wheel off, and latch every connector fully.
Problem
- Your clock spring carries the horn, airbag and often SWC signals through the column.
Symptoms
- Your horn or cruise behaves oddly after the wheel was removed for service.
- The reference marks on the clock spring no longer line up after you turned the hub with the wheel off.
Cause
- If you spin the hub past the supplier rotation budget, you damage or misalign the ribbon inside the clock spring.
Fix Step-by-step
- Park with the wheels straight: centre the rack, then paint-pen or tape the hub-to-shaft relationship to match the OEM photos.
- Battery off, wait, then unplug the SRS: follow the discharge time in the manual before you touch the yellow connectors.
- Remove the wheel without shock-loading the column: use a puller if it's specified. Shock it sideways and you stress the ribbon.
- Lock the rotation during service: use the supplier lock pin or the prescribed restraint. Common mistake: spinning the hub “for access” with the wheel off. Do that and you use up ribbon travel.
- Reinstall on the index marks: the clock spring dots and tabs line up neutral, the spline engages without forcing, and the horn slip ring sits centred before you torque the nut.
- Dress the harness slack: go to full lock left and right with the engine off. You shouldn't feel a connector tug or hear a ribbon peel sound.
If the alignment marks don't mate
- Stop, and assume the ribbon may be damaged. Get a qualified SRS tech to inspect it, don't guess extra turns.