Dodge Ram Truck 1500-2500-3500. Manual — part 15

C143D-STABILIZER SELECT SWITCH PERFORMANCE (CONTINUED)

5.

INTERMITTENT WIRING AND CONNECTORS

The conditions necessary to set this DTC are not present at this time.

Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.

Wiggle test the wiring harness and connectors while checking for shorted and open circuits.

Using the DRBIII

T

, monitor the data related to this circuit while performing the wiggle test. Look for the data to

change or for the DTC to reset.

While monitoring the Stabilizer Bar State on the DRBIII

T

, move the switch to each position. The DRBIII

T

display

must match the position on the actual switch.

Were there any problems found?

Yes

>> Repair as necessary.

Perform FDCM VERIFICATION TEST.

No

>> Test Complete.

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ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS

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C143E - STABILIZER BAR SWITCH CIRCUIT LOW

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ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS

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C143E - STABILIZER BAR SWITCH CIRCUIT LOW (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

•

When Monitored:
Ignition on.

•

Set Condition:
During switch operation, the FDCM senses the Disconnecting Stabilizer Bar Switch sense is below 0.25 volt.

Possible Causes

SWITCH INTERMITTENT

DISCONNECTING STABILILZER BAR SWITCH

(T536) SWITCH SUPPLY CIRCUIT SHORTED TO GROUND

(T531) STABILIZER BAR SWITCH SENSE CIRCUIT SHORT TO GROUND

FDCM

1.

DTC ACTIVE

CAUTION: Before removing the FDCM harness connector, clean the connector and locking cam area of dirt
and debris. Failure to do so can result in the connector being jammed or damage to the locking cams on
the harness connector or module. Do not force the assist arm when releasing or installing the harness con-
nector.
Turn the ignition on, engine not running

With the DRBIII

T

, read FDCM DTC(s).

Is the DTC active at this time?

Yes

>> Go To 2

No

>> Go To 5

2.

DISCONNECTING STABILIZER BAR SWITCH OPERATION

NOTE: Before continuing with the below diagnostic test, ensure the FDCM harness connector seal is
installed correctly. Inspect the terminals on both harness connector and the module for damage. Failure to
do so can result in misdiagnoses of the system.
Turn the ignition off.

Disconnect the Disconnecting Stabilizer Switch harness connector.

Remove the Disconnecting Stabilizer Switch.

Measure the resistance on the Disconnecting Stabilizer Switch between the Switch Supply terminal and the Stabi-
lizer Switch Sense terminal.

The resistance must read as follows for each position of the switch.

•

Off Road: 33 ohms +/- 5%

•

On Road: 420 ohms +/- 5%

•

Switch Not Applied: 2.2k ohms +/- 5%

Does the ohmmeter read correctly for each position of the Stabilizer Bar Switch

Yes

>> Go To 3

No

>> Replace the Disconnecting Stabilizer Switch.

Perform FDCM VERIFICATION TEST.

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ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS

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C143E - STABILIZER BAR SWITCH CIRCUIT LOW (CONTINUED)

3.

(T531) STABILIZER BAR SWITCH SENSE CIRCUIT SHORTED TO GROUND

Disconnect the FDCM harness connector.

Measure the resistance of the (T531) Stabilizer Bar Switch Sense cir-
cuit in the Disconnecting Stabilizer Switch harness connector to
ground.

Is the resistance below 5.0 ohms?

Yes

>> Repair the short to ground in the (T531) Disconnecting

Stabilizer Switch Sense circuit.

Perform FDCM VERIFICATION TEST.

No

>> Go To 4

4.

(T536) SWITCH SUPPLY CIRCUIT SHORT TO GROUND

Measure the resistance of the (T536) Switch Supply circuit in the Dis-
connecting Stabilizer Switch harness connector to ground.

Is the resistance below 5.0 ohms?

Yes

>> Repair the short to ground in the (T536) Switch Supply cir-

cuit.

Perform FDCM VERIFICATION TEST.

No

>> Replace the FDCM in accordance with the Service Infor-

mation

Perform FDCM VERIFICATION TEST.

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ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS

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