sierrafery
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in normal operating mode the SLS warnins is not supposed to flash, only the ORM one, there are only two cases when the SLS fault warning is supposed to flash but both are ''special'' cases, so let's rule these out first:
1. if you use the SLS remote to lower or rais the rear, so if you have such fob make sure it's not in the car with the lowering button stuck... is your central locking working normally, very uncommon but it's possible that the roof receiver to erratically send that specific lowering command like when you use the fob
2. if it's set to transport mode
i quote you exactly the operation and think about that and if everything in this rea is ruled out then the ECU remains the last suspect, the SLABS ECU is behind the glovebox, it's common for SLS and ABS
1. if you use the SLS remote to lower or rais the rear, so if you have such fob make sure it's not in the car with the lowering button stuck... is your central locking working normally, very uncommon but it's possible that the roof receiver to erratically send that specific lowering command like when you use the fob
2. if it's set to transport mode
i quote you exactly the operation and think about that and if everything in this rea is ruled out then the ECU remains the last suspect, the SLABS ECU is behind the glovebox, it's common for SLS and ABS
1. ....
When raising or lowering the SLS using the remote handset, the SLS warning lamp will flash and the audible warning
will sound when the system is operating. When the SLS is fully lowered the warning lamp will stay illuminated. The
SLS will reset to normal ride height if the vehicle speed exceeds 3 mph (5 km/h) for 10 seconds when the SLS is
lowered.
2. ...
The transportation mode lowers the rear suspension onto the bump stops with the engine not running. When the
suspension is in transportation mode, the SLS warning lamp is continuously illuminated when the ignition is in position
II.
When the engine is started in transportation mode, the SLS system will raise the rear suspension until a gap of 25
mm (1 in.) exists between the bump stop and the axle. The SLS warning lamp will flash continuously while the SLS
system is raising the suspension. When the gap between the bump stop and the axle is achieved, the warning lamp
will illuminate continuously.
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