Diagnostic Test

ACTIVE DTC
Start the engine and allow it to idle for at least 60 seconds.

WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

NOTE: It may be necessary to test drive the vehicle and operate the speed control in order for this DTC to set.

With a scan tool, select View DTCs.

Is the DTC Active at this time?

Yes
1. Go To 2.
No
1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
SPEED CONTROL SWITCH
Turn the ignition off.

Remove and disconnect the Speed Control Switches from the steering wheel per Service Information.

Measure the resistance across each Speed Control Switch.

Monitor the ohmmeter while pressing each function button on each switch.

The following resistance specs are taken between terminals (V371) S/C Switch No.1 Signal and (V397) S/C Switch Return circuits of the Switch when holding the switch button in the following position

Not pressing any switch - 20.5 kohms

On/Off - 0.47 kohms

Set - 5.49 kohms

Coast - 2.94 kohms

Cancel - 1.24 kohms

Resume/Accel - 15.4 kohms

Does the function on the Speed Control Switches have the correct resistance value?

Yes
1. Go To 3.
No
1. Replace the Speed Control Switch that had the incorrect resistance value.
2. Perform POWERTRAIN VERIFICATION TEST .
(V371) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Checking Speed Control Switch No. 1 Signal Circuit Shorted To Battery Voltage
Courtesy of CHRYSLER LLC

Disconnect the C3 PCM harness connector.

Disconnect the C3 Steering Column Control Module harness connector.

Ignition on, engine not running.

Measure the voltage on the (V371) S/C Switch No.1 Signal circuit in the S/C Switch harness connectors.

Is there any voltage present?

Yes
1. Repair the short to voltage in the (V371) S/C Switch No.1 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 4.
(V71) S/C SWITCH SENSE 1 CIRCUIT SHORTED TO VOLTAGE

Fig 2: Checking Speed Control Switch No. 1 Signal Circuit
Courtesy of CHRYSLER LLC

Disconnect the C1 Steering Column Control Module harness connector per Service Information.

Ignition on, engine not running.

Measure the voltage on the (V71) S/C Switch Sense 1 circuit in the C1 SCCM harness connector.

Is there any voltage present?

Yes
1. Repair the short to voltage in the (V71) S/C Switch Sense 1 circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 5.
STEERING COLUMN CONTROL MODULE
Turn the ignition off.

Measure the resistance of the (V371), (V71) S/C Switch No.1 Signal circuit between the C1 and C3 SCCM connections.

Measure the resistance of the (V397), (V937) Switch Return circuit between the C1 and C3 SCCM connections.

Is the resistance above 5.0 ohms for either reading?

Yes
1. Replace the Steering Column Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 6.
(V371) S/C SWITCH NO.1 SIGNAL CIRCUIT OPEN

Fig 3: Checking Speed Control Switch No. 1 Signal Circuit
Courtesy of CHRYSLER LLC

NOTE: The measurement must be taken from both Speed Control Switch harness connectors.

Measure the resistance of the (V371) S/C Switch No.1 Signal circuit from the Speed Control Switches to the C3 SCCM harness connector.

Is the resistance below 5.0 ohms for each measurement?

Yes
1. Go To 7.
No
1. Repair the open in the (V371) S/C Switch No.1 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
(V71) S/C SWITCH SENSE 1 CIRCUIT OPEN

Fig 4: Checking Speed Control Switch No. 1 Signal Circuit
Courtesy of CHRYSLER LLC

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

Measure the resistance of the (V71) S/C Switch Sense 1 circuit from the C1 SCCM harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms for both measurements?

Yes
1. Go To 8.
No
1. Repair the open in the (V71) S/C Switch Sense 1 circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
(V397) SWITCH RETURN CIRCUIT OPEN

Fig 5: Checking Speed Control Switch Return Circuit (V397) For Open
Courtesy of CHRYSLER LLC

NOTE: The measurement must be taken from both Speed Control Switch harness connectors.

Measure the resistance of the (V397) Switch Return circuit from the S/C Switch harness connectors to the C3 SCCM harness connector.

Is the resistance below 5.0 ohms for each measurement?

Yes
1. Go To 9.
No
1. Repair the open in the (V397) Switch Return circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
(V937) SWITCH RETURN CIRCUIT OPEN

Fig 6: Checking Speed Control Switch Return Circuit (V937) For Open
Courtesy of CHRYSLER LLC

Measure the resistance of the (V937) Switch Return circuit from the C1 SCCM harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms for both measurements?

Yes
1. Go To 10.
No
1. Repair the open in the (V937) Switch Return circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
(V71) S/C NO.1 SWITCH SIGNAL CIRCUIT SHORTED TO GROUND

Fig 7: Checking Speed Control Switch No. 1 Signal Circuit
Courtesy of CHRYSLER LLC

Measure the resistance between ground and the (V71) S/C Switch Sense 1 circuit in the C1 SCCM harness connector.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (V71) S/C Switch Sense 1 circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 11.
(V371) S/C NO.1 SWITCH SIGNAL CIRCUIT SHORTED TO GROUND

Fig 8: Checking Speed Control Switch No. 1 Signal Circuit Shorted To Ground
Courtesy of CHRYSLER LLC

Measure the resistance between ground and the (V371) S/C Switch No.1 Signal circuit in the S/C Switch harness connectors.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (V371) S/C Switch No.1 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 12.
(V371) S/C SWITCH NO.1 SIGNAL CIRCUIT SHORTED TO THE (V397) S/C SWITCH RETURN CIRCUIT

Fig 9: Checking Speed Control Switch No. 1 Signal Circuit Shorted To Return Circuit
Courtesy of CHRYSLER LLC

Measure the resistance between the (V371) S/C Switch No.1 Signal circuit and the (V397) S/C Switch Return circuit in the S/C Switch harness connectors.

Is the resistance below 5.0 ohms?

Yes
1. Repair the short between the (V371) S/C Switch No.1 Signal circuit and the (V397) Switch Return circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 13.
(V71) S/C SWITCH SENSE 1 CIRCUIT SHORTED TO THE (V937) S/C SWITCH RETURN CIRCUIT

Fig 10: Checking Speed Control Switch No. 1 Signal Circuit & Return Circuit
Courtesy of CHRYSLER LLC

Measure the resistance between the (V71) S/C Switch Sense 1 circuit and the (V937) S/C Switch Return circuit in the C1 SCCM harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Repair the short between the (V71) S/C Switch Sense 1 circuit and the (V937) Switch Return circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To 14.

SPEED CONTROL SWITCH VOLTAGE VALUES

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 and #8815-1 to perform diagnosis.

Install Miller Special Tool #8815-1 on the C3 PCM harness connector.

Connect the S/C Switch harness connectors.

Connect the SCCM harness connectors.

Turn the ignition on.

With a scan tool, monitor the S/C Switch voltage readings.

Using a voltmeter check the voltage on the (V37) S/C Switch Sense 1 circuit and the (V38) S/C Switch Sense 2 circuit at the appropriate terminals of the special tool #8815.

Monitor the voltmeter.

With a scan tool, monitor the S/C Switch voltage readings.

SWITCH POSITION	SWITCH No.1 VOLTAGE VALUE	SWITCH No.2 VOLTAGE VALUE
NO SWITCHES PRESSED	4.31 to 4.78 volts	4.31 to 4.78 volts
ON/OFF PRESSED	0.59 to 1.13 volts	3.53 to 3.92 volts
RES/ACCEL PRESSED	3.88 to 4.17 volts	2.04 to 2.47 volts
SET PRESSED	3.16 to 3.56 volts	1.17 to 1.56 volts
COAST PRESSED	2.57 to 2.94 volts	0.77 to 1.09 volts
CANCEL PRESSED	1.59 to 1.99 volts	2.84 to 3.25 volts

Compare the voltage readings on the voltmeter to what the scan tool displayed.

Are the voltage readings out of the listed specification and is there less than a 0.2 of a volt difference between the voltmeter switch values and the scan tool switch value?

Yes

Replace the Speed Control Switch.
Perform POWERTRAIN VERIFICATION TEST .

Go To 15.

POWERTRAIN CONTROL MODULE (PCM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Speed Control Switch and the Powertrain Control Module (PCM).

Look for any chafed, pierced, pinched, or partially broken wires.

Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Switch and Powertrain Control Module connectors.

Refer to any Technical Service Bulletins that may apply.

Were there any problems found?

Yes
1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Replace and program the Powertrain Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .