Pinpoint Test G: DTC C1830

Vehicle Dynamic Suspension

Pinpoint Tests


Pinpoint Test G: DTC C1830

Refer to Wiring Diagram Set 41, Vehicle Dynamic Suspension for schematic and connector information. Diagrams By Number

Normal Operation

The Vehicle Dynamics Module (VDM) engages the air suspension relay by providing voltage to the relay along circuit 420 (DB/YE), ground for the relay is provided along 57 (BK). Once the relay is engaged, fused battery voltage is supplied from Battery Junction Box (BJB) fuse 112 (30A) to the relay along circuit 1053 (LB/PK), the voltage travels through the relay and to the air suspension compressor along circuit 538 (GY/RD). The compressor is provided a ground path along circuit 57 (BK).

- DTC C1830 (Air Compressor Relay Circuit Failure) - With the ignition in the RUN position and during a deflate (vent) or inflate (pump) activity, if the VDM detects an open, a short to voltage or a short to ground on the air compressor relay circuit 420 (DB/YE), DTC C1830 will be set.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Air compressor relay
- VDM



PINPOINT TEST G: DTC C1830

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

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G1 ISOLATE THE AIR COMPRESSOR RELAY


- Carry out the mini-ISO relay component test.

- Inspect the relay and socket for corrosion, pushed-out pins and spread terminals.
- Does the air compressor relay pass the test and are the relay and socket OK?

Yes
GO to G2.

No
REPAIR or INSTALL a new air compressor relay as necessary. CLEAR the DTC. REPEAT the self-test.

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G2 CHECK CIRCUIT 420 (DB/YE) FOR A SHORT TO VOLTAGE


- Disconnect: VDM C2131a.
- Measure the voltage between VDM C2131a-6, circuit 420 (DB/YE), harness side and ground.
- Is any voltage present?

Yes
REPAIR circuit 420 (DB/YE). CLEAR the DTC. REPEAT the self-test.

No
GO to G3.

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G3 CHECK CIRCUIT 420 (DB/YE) FOR AN OPEN


- Measure the resistance between VDM C2131a-6, circuit 420 (DB/YE), harness side and air suspension relay cavity 86, circuit 420 (DB/YE) harness side.




- Is the resistance less than 5 ohms?

Yes
GO to G4.

No
REPAIR circuit 420 (DB/YE). CLEAR the DTC. REPEAT the self-test.

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G4 CHECK CIRCUIT 420 (DB/YE) FOR A SHORT TO GROUND


- Measure the resistance between VDM C2131a-6, circuit 420 (DB/YE), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
INSTALL a new VDM. REFER to Vehicle Dynamics Module (VDM) Service and Repair. REPEAT the self-test.

No
REPAIR circuit 420 (DB/YE). CLEAR the DTC. REPEAT the self-test.

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