Circuit Description
The LEVELING indicator lamp is activated by the Automatic Level Control (ALC) sensor whenever a compress cycle is requested. The sensor provides a switched path to ground. The sensor will flash the lamp when certain DTCs are detected.
Conditions for Setting the DTC
The DTC will set when the sensor detects that the lamp output is not pulled down ground when the sensor output is active and the ignition signal is high.
Action Taken When the DTC Sets
| • | The sensor's discrete low side output drive for the lamp is disabled. |
| • | The sensor continuously attempts to recover from the fault. |
| • | DTC 09 is stored as a history code at the end of the ignition cycle. |
Conditions for Clearing the DTC
| • | The DTC will clear when B+ is present at the low side output drive. |
| • | Using a scan tool. |
Diagnostic Aids
| • | Check the integrity of the LEVELING indicator lamp bulb. |
| • | Refer to the diagnostic table. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Automatic Level Control (ALC) System Check performed? | -- | Go to ALC Suspension System Check . | |
Is the voltage reading within the specified value? | -- | |||
3 | Locate and repair a short to B+ in circuits XY1 and/or XY2. Is the repair complete? | -- | -- | |
4 | Replace the ALC sensor. Refer to Automatic Level Control Sensor Replacement . Is the replacement complete? | -- | -- | |
5 |
Does the LEVELING indicator lamp operate properly? | -- | System OK |
