Diagnostic Test

1) ACTIVE DTC
NOTE: This DTC is a two trip fault. If the scan tool indicates a one trip failure, the possible cause may have been the customer pressing both switches simultaneously. Test drive the vehicle and activate the Speed Control system. If the DTC matures to an active fault a repair is necessary.

Ask the customer if it is possible that two buttons were pressed at the same time before this DTC set. If this is the case, no repair is necessary.

Start the engine.

Allow the engine to reach normal operating temperature.

With a scan tool, select View DTCs.

NOTE: It may be necessary to drive the vehicle to meet the conditions to set this DTC, try to repeat the conditions in which the fault originally set by reviewing the Freeze Frame data.

Is the DTC Active or Pending at this time?

Yes
1. Go to 2).
No
1. Refer to INTERMITTENT CONDITION Diagnostic Procedure.
2) SPEED CONTROL ON/OFF SWITCH
With the scan tool, monitor the Speed Control Switch voltage.

Disconnect the Speed Control On/Off Switch harness connector.

Did the voltage change to above 4.8 volts?

Yes
1. Replace the Speed Control On/Off Switch.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 3).
3) SPEED CONTROL RESUME/ACCEL SWITCH
With the scan tool, monitor the Speed Control Switch voltage.

Disconnect the Speed Control Resume/Accel Switch harness connector.

Did the voltage change to above 4.8 volts?

Yes
1. Replace the Speed Control Resume/Accel Switch.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 4).
4) SPEED CONTROL SWITCHES
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 (V372) S/C Switch No. 2 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 - 8.87 kohms

Set - 0.825 kohms

Coast - 0.47 kohms

Cancel - 3.92 kohms

Resume/Accel - 1.87 kohms

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 5).
No
1. Replace the Speed Control Switch that had the incorrect resistance value.
2. Perform POWERTRAIN VERIFICATION TEST .
5) S/C SWITCH SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE

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

Fig 2: Checking Speed Control Switch No. 2 Signal Circuit For Short To Voltage
Courtesy of CHRYSLER LLC

Disconnect the C3 PCM harness connector.

Measure the voltage on the (V371) and (V372) S/C Switch Signal circuits at both Speed Control harness connectors.

Is the voltage above 5.0 volts?

Yes
1. Repair the short to battery voltage in the (V371) or (V372) S/C Switch Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 6).
6) STEERING COLUMN CONTROL MODULE
Turn the ignition off.

Disconnect the C1 and C3 SCCM harness connectors per Service Information.

Measure the resistance of the (V371/V71) and (V372/V72) S/C Switch Signal circuits between the C1 and C3 SCCM connectors.

Measure the resistance of the (V397/V937) Switch Return circuit between the C1 and C3 SCCM harness connectors.

Is the resistance above 5.0 ohms for any one of the measurements?

Yes
1. Replace the SCCM per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 7).
  NOTE: Connect the Steering Column Control Module harness connectors per Service Information before continuing.
7) S/C SWITCH SIGNAL CIRCUIT OPEN

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

Fig 4: Checking Speed Control Switch No. 2 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 (V371/V71) and (V372/V72) S/C Switch Signal circuits from both Speed Control harness connectors to the appropriate terminals of special tool #8815.

Is the resistance below 5.0 ohms for each measurement?

Yes
1. Go to 8).
No
1. Repair the excessive resistance in the (V371/V71) or (V372/V72) S/C Switch Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
8) (V397/V937) SWITCH RETURN CIRCUIT OPEN

Fig 5: Checking Speed Control Switch Return Circuit Open
Courtesy of CHRYSLER LLC

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

Measure the resistance of the (V397/V937) Switch Return circuit from both Speed Control harness connector to the appropriate terminal of special tool #8815.

Is the resistance below 5.0 ohms for both measurements?

Yes
1. Go to 9).
No
1. Repair the excessive resistance in the (V397/V937) Switch Return circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
9) S/C SWITCH SIGNAL CIRCUITS SHORTED TO THE (V397/V937) SWITCH RETURN CIRCUIT

Fig 6: Checking Speed Control Switch No. 1 Signal Circuit Shorted To Return Circuit
Courtesy of CHRYSLER LLC

Fig 7: Checking Speed Control Switch Signal Circuits For Short To Return Circuit
Courtesy of CHRYSLER LLC

Measure the resistance between the (V397) Switch Return circuit and both of the (V371) and (V372) S/C Switch Signal circuits in the S/C Switch harness connector.

Is the resistance below 5.0 ohms?

Yes
1. Repair the short between the (V397/V937) Switch Return circuit and the (V371/V71) or (V372/V72) S/C Switch Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 10).
10) (V371/V71) S/C SWITCH NO. 1 SIGNAL CIRCUIT SHORTED TO THE (V372/V72) S/C SWITCH NO. 2 SIGNAL CIRCUIT

Fig 8: Checking Speed Control Switch No. 1 Signal Circuit & No. 2 Signal Circuit
Courtesy of CHRYSLER LLC

Measure the resistance between the (V371/V71) S/C Switch No. 1 Signal circuit and the (V372/72) S/C Switch No. 2 Signal circuit at both Speed Control harness connectors.

Is the resistance below 100 ohms for each circuit?

Yes
1. Repair the short between the (V372/V72) S/C Switch No. 2 Signal circuit and the (V371) S/C Switch No. 1 Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 11).
11) S/C SWITCH SIGNAL CIRCUITS SHORTED TO GROUND

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

Fig 10: Checking Speed Control Switch No. 2 Signal Circuit For Short To Ground
Courtesy of CHRYSLER LLC

Measure the resistance between ground and the (V371/V71) and (V372/V72) S/C Switch Signal circuits at both S/C Switch harness connectors.

Is the resistance below 100 ohms?

Yes
1. Repair the short to ground in the (V371/V71) or (V372/V72) S/C Switch Signal circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go to 12).

12) 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.

Using a voltmeter check the voltage on the (V37) S/C Switch No. 1 Signal circuit and the (V38) S/C Switch No. 2 Signal circuit at the appropriate terminals of the special tool #8815.

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.

Start the engine and allow it to reach normal operating temperature.

Monitor the voltmeter.

Allow the engine to idle.

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 values?

Yes

Replace the Speed Control Switch.
Perform POWERTRAIN VERIFICATION TEST .

Go to 13).

13) PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

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 .