Pinpoint Test A: No Communication With The Air Suspension Control Module

WARNING: This page is about a different car, the 2006 Lincoln Navigator and 2006 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: The Flex Probe Kit must be used for all test connections. Use of standard multimeter probes may damage wiring terminals.

A1 CHECK CIRCUITS 1003 (GY/YE) AND 1524 (DB) FOR AN OPEN

Key in OFF position.
Disconnect: Air Suspension Control Module C2131a.
Key in ON position.

Measure the voltage between the following air suspension control module C2131a pins, harness side and ground:

PINOUTS REFERENCE TABLE

Pin	Circuit
1	1524 (DB)
4	1003 (GY/YE)
15	1524 (DB)

Are the voltages greater than 10 volts?

Yes: GO to A2.

No: VERIFY CJB fuses 30 (25A) and 27 (5A) are OK. If OK, REPAIR the affected circuit(s) for an open. TEST the system for normal operation.

A2 CHECK CIRCUIT 875 (BK/LB) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the air suspension control module C2131a-19, circuit 875 (BK/LB), harness side and ground.
  
  Fig 1: Checking Circuit 875 (BK/LB) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes: CHECK the module communication network. REFER to COMMUNICATIONS NETWORK .

No: REPAIR circuit 875 (BK/LB) for an open. TEST the system for normal operation.