Rear of Vehicle Low w/o F45
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Automatic Level Control Schematics | ||||
1 |
Important: Perform a close visual inspection of all air lines, connectors and components. Did you perform the Automatic Level Control (ALC) Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the ALC relay turn ON and OFF with each command? | -- | Go to Step 8 | Go to Step 3 |
3 |
Does the test lamp illuminate? | -- | Go to Step 4 | Go to Step 15 |
4 |
Does the test lamp turn ON and OFF with each command? | -- | Go to Step 11 | Go to Step 5 |
5 | Does the test lamp remain illuminated with each command? | -- | Go to Step 7 | Go to Step 6 |
6 | Test the control circuit of the ALC relay for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 13 |
7 | Test the control circuit of the ALC for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 13 |
8 |
Did the test lamp illuminate? | -- | Go to Step 9 | Go to Step 13 |
9 |
Is the resistance lower than the specified value? | 5 ohms | Go to Step 12 | Go to Step 14 |
10 | Test the ALC compressor motor battery positive feed circuit for an open. Refer to Circuit Testing in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 11 |
11 | Inspect for poor connections at the ALC relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 16 |
12 | Inspect for poor connections at the ALC compressor assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 17 |
13 | Inspect for poor connections at the harness connector of the Rear Integration Module (RIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 19 | Go to Step 18 |
14 | Repair the high resistance/ open ALC compressor ground circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 19 | -- |
15 | Repair the coil side feed circuit of the ALC relay Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 19 | -- |
16 | Replace the ALC relay . Did you complete the replacement? | -- | Go to Step 19 | -- |
17 | Replace the ALC compressor assembly. Refer to Air Compressor Replacement . Did you complete the replacement? | -- | Go to Step 19 | -- |
18 | Replace the RIM . Refer to Rear Integration Body Control Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 19 | -- |
19 | Operate the system to verify the repair. Does the system operate normally? | -- | System OK | Go to Step 2 |
Rear of Vehicle Low w/F45
Step | Action | Value(s) | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Automatic Level Control Schematics | ||||||||||||
1 | Did you perform the Automatic Level Control (ALC) Diagnostic System Check? | -- | Go to Step 2 | |||||||||
2 |
Does the air compressor come on within 30 seconds? | -- | Go to Step 9 | Go to Step 3 | ||||||||
3 |
Does the voltmeter display a voltage greater than 10 volts? | -- | Go to Step 4 | Go to Step 7 | ||||||||
4 |
Is there continuity? | -- | Go to Step 6 | Go to Step 5 | ||||||||
5 |
Is the repair complete? | -- | Go to Step 14 | -- | ||||||||
6 | Replace the ALC air compressor assembly. Refer to Air Compressor Replacement . Is the repair complete? | -- | Go to Step 12 | -- | ||||||||
7 |
Was a problem found? | -- | Go to Step 8 | -- | ||||||||
8 |
Important: A blown fuse may indicate:
Repair the shorted circuit condition or replace the fuse. Is the repair complete? | -- | Go to Step 14 | -- | ||||||||
9 | Inspect the left and right rear position sensors for damage and disconnected links. Are any damaged sensors or disconnected links present? | -- | Go to Step 13 | Go to Step 10 | ||||||||
10 | Perform the ALC System Leak Test. Is a leak present? | -- | Go to Step 11 | Go to Step 12 | ||||||||
11 | Repair the leak in the ALC System. Is the repair complete? | -- | Go to Step 14 | -- | ||||||||
12 |
Has the ALC trim height adjustment been completed? | -- | Go to Step 14 | -- | ||||||||
13 | Replace the damaged rear position sensor or reconnect the link. Refer to Automatic Level Control Sensor Replacement . Is the replacement complete? | -- | Go to Step 14 | -- | ||||||||
14 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 1 | ||||||||
