Dodge Ram Truck 1500-2500-3500. Manual — part 19

CHECKING STABILIZER SELECT SWITCH OPERATION

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ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS

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CHECKING STABILIZER SELECT SWITCH OPERATION (CONTINUED)

For a complete wiring diagram Refer to Section 8W.

Possible Causes

STABILIZER BAR SWITCH

(T531) STABILIZER BAR SWITCH SENSE CIRCUIT SHORT TO VOLTAGE

(T536) SWITCH SUPPLY CIRCUIT SHORTED TO (T531) STABILIZER BAR SWITCH SENSE CIRCUIT

(T536) STABILIZER BAR SWITCH SENSE CIRCUIT OPEN

FDCM

Diagnostic Test

1.

STABILIZER SELECT SWITCH OPERATION

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 off.

Secure the vehicle by blocking the rear wheels from the front and back.

Disconnect the Stabilizer Bar Link on the passenger side.

Turn the ignition on, Stabilizer Select Switch in the ON ROAD position.

The Stabilizer Bar should not move up and down.

Using the Stabilizer Select Switch, select OFF ROAD.

Attempt to move the Stabilizer Bar up and down.

Does the Stabilizer Bar operate as described above?

Yes

>> Stabilizer Select Switch is operating normally. Test complete.

No

>> Go To 2

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ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS

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CHECKING STABILIZER SELECT SWITCH OPERATION (CONTINUED)

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 Bar Switch harness connector.

Remove the Disconnecting Stabilizer Bar Switch.

Measure the resistance on the Disconnecting Stabilizer Bar Switch between the Switch Supply terminal and the
Stabilizer Bar 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 Disconnecting Stabilizer Bar Switch

Yes

>> Go To 3

No

>> Replace the Disconnecting Stabilizer Bar Switch.

Perform FDCM VERIFICATION TEST.

3.

(T531) STABILIZER BAR SWITCH SENSE CIRCUIT SHORTED TO VOLTAGE

Disconnect the FDCM harness connector.

Turn the ignition on.

Measure the voltage of the (T531) Stabilizer Bar Switch Sense circuit
in the Disconnecting Stabilizer Bar Switch harness connector.

Does the voltmeter indicate voltage present?

Yes

>> Repair the short to voltage in the (T531) Stabilizer Bar

Switch Sense circuit.

Perform FDCM VERIFICATION TEST.

No

>> Go To 4

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ACTIVE CHASSIS - ELECTRICAL DIAGNOSTICS

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CHECKING STABILIZER SELECT SWITCH OPERATION (CONTINUED)

4.

(T536) SWITCH SUPPLY CIRCUIT SHORTED TO (T351) STABILIZER BAR SWITCH SENSE CIRCUIT

Measure the resistance between (T536) Switch Supply circuit and the
(T531) Stabilizer Bar Switch Sense circuit in the Disconnecting Stabi-
lizer Bar Switch harness connector.

Is the resistance below 5.0 ohms?

Yes

>> Repair the short between (T536) Switch Supply circuit and

the (T531) Stabilizer Bar Switch Sense circuit.

Perform FDCM VERIFICATION TEST.

No

>> Go To 5

5.

(T531) STABILIZER BAR SWITCH SENSE CIRCUIT OPEN

Measure the resistance of the (T531) Stabilizer Bar Switch Sense cir-
cuit between the Disconnecting Stabilizer Bar Switch and the FDCM
harness connectors.

Is the resistance below 5.0 ohms?

Yes

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

mation.

Perform FDCM VERIFICATION TEST.

No

>> Repair the open in the (T531) Stabilizer Bar Switch Sense

circuit.

Perform FDCM VERIFICATION TEST.

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