Pinpoint Test M: The Air Suspension Indicator Is Never/Always On (If Equipped)

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

M1 VERIFY THE OPERATION OF THE AIR SUSPENSION SYSTEM
- Operate the air suspension system and verify that it operates correctly.
- Does the air suspension system operate correctly?
Yes : GO to M2.

No : REFER to VEHICLE DYNAMIC SUSPENSION to continue diagnosis on the air suspension system.
M2 CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE DIAGNOSTIC TOOL
- Key in ON position.
- Enter the following diagnostic mode on the scan tool: Instrument Cluster Active Command.
- Select the instrument cluster indicator lamp control active command. Trigger the air suspension indicator active command on and off. Observe the air suspension indicator.
- Does the air suspension indicator illuminate when triggered on, and turn off when triggered off?
Yes : GO to M3.

No : GO to M9.
M3 CHECK THE AIR SUSPENSION INDICATOR OPERATION
- Key in OFF position.
- Disconnect: Air Suspension Module C2131b.
- Key in START position.
- Observe the air suspension indicator.
- Does the air suspension indicator illuminate?
Yes : GO to M4.

No : GO to M5.
M4 CHECK CIRCUIT 419 (DG/LG) FOR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: Instrument Cluster C2220.
- Measure the resistance between the instrument cluster C2220-10, circuit 419 (DG/LG), harness side and ground.
  
  Fig 1: Measuring Resistance Between Instrument Cluster C2220-10, Circuit 419 (DG/LG), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 10,000 ohms?
Yes : GO to M9.

No : REPAIR the circuit. TEST the system for normal operation.
M5 CHECK THE INSTRUMENT CLUSTER AIR SUSPENSION INDICATOR
- Key in OFF position.
- Connect a fused (10A) jumper wire between the air suspension module C2131b-11, circuit 419 (DG/LG), harness side and ground.
  
  Fig 2: Connecting Fused (10A) Jumper Wire Between Air Suspension Module C2131B-11 And Ground
  Courtesy of FORD MOTOR CO.
- Key in START position.
- Does the air suspension indicator illuminate?
Yes : GO to M8.

No : GO to M6.
M6 CHECK CIRCUIT 419 (DG/LG) FOR AN OPEN
- Key in OFF position.
- Disconnect: Instrument Cluster C2220.
- Measure the resistance between the instrument cluster C2220-10, circuit 419 (DG/LG), harness side and the air suspension module C2131b-11, circuit 419 (DG/LG), harness side.
  
  Fig 3: Measuring Resistance Between Instrument Cluster C2220-10 And Air Suspension Module C2131B-11
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to M7.

No : REPAIR the circuit. TEST the system for normal operation.
M7 CHECK CIRCUIT 419 (DG/LG) FOR SHORT TO VOLTAGE
- Key in ON position.
- Measure the voltage between the instrument cluster C2220-10, circuit 419 (DG/LG), harness side and ground.
  
  Fig 4: Measuring Voltage Between Instrument Cluster C2220-10, Circuit 419 (DG/LG), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
- Is any voltage indicated?
Yes : GO to M9.

No : REPAIR the circuit. TEST the system for normal operation.
M8 CHECK FOR CORRECT AIR SUSPENSION MODULE OPERATION
- Disconnect all the air suspension module connectors.
- Check for:
  - corrosion
  - pushed-out pins
- Connect all the air suspension module connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new air suspension module. REFER to VEHICLE DYNAMIC SUSPENSION . TEST the system for normal operation.

No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
M9 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION
- Disconnect the instrument cluster connector.
- Check for:
  - corrosion
  - pushed-out pins
- Connect the instrument cluster connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.

No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.