DTC C1180 or C1183

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. DTC Descriptors DTC C1180 Right Running Board Step Motor Retract Control Circuit DTC C1181 Right Running Board Step Motor Extend Control Circuit DTC C1182 Left Running Board Step Motor Extend Control Circuit DTC C1183 Left Running Board Step Motor Retract Control Circuit For symptom byte information, refer to Symptom Byte List. Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performanc
Right Motor Control Terminal 3 X1	C1180 11 C1181 11	C1180 13 C1181 13	C1180 12 C1181 12	—
Right Motor Control Terminal 6 X1	C1180 11 C1181 11	C1180 13 C1181 13	C1180 12 C1181 12	—
Left Motor Control Terminal 2 X1	C1182 11 C1183 11	C1182 13 C1183 13	C1182 12 C1183 12	—
Left Motor Control Terminal 5 X1	C1182 11 C1183 11	C1182 13 C1183 13	C1182 12 C1183 12	—

Circuit/System Description The running board control module controls the running board actuators to extend or retract the running boards. The running board control module supplies the actuator motor with a PWM 12 V control circuit and a ground control circuit. The running board control module controls the direction of the actuator by changing the polarity of the control circuits. Conditions for Running the DTC The ignition is ON. Ignition voltage is between 9–16 V. The assist step disable switch is not enabled in the infotainment system. Conditions for Setting the DTC C1180 12, C1181 12, C1182 12, C1183 12 A motor control circuit is shorted to battery voltage. C1180 11, C1181 11, C1182 11, C1183 11 A motor control circuit is shorted to ground. C1180 13, C1181 13, C1182 13, C1183 13 A motor control circuit is open. Action Taken When the DTC Sets The motor drive circuits are deactivated for the appropriate actuator. Conditions for Clearing the DTC The DTC becomes history when the running board control module no longer detects the condition that set the DTC. The history DTC will clear after 40 fault free ignition cycles. Reference Information Schematic Reference Step/Running Board Schematics Connector End View Reference Master Electrical Component List Description and Operation Running Board Description Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Circuit/System Verification

1. Ignition ON.
2. Verify using the infotainment system menu that the automatic running boards are enabled. ⇒ If the running boards are disabled Enable the running boards by navigating to the switch integrated into the infotainment system. ⇓ If the running boards are enabled
3. Verify the left and right side running boards extend and retract when opening and closing the left and right side doors. ⇒ If the both running boards do not extend or retract Perform Circuit/System Testing ⇓ If the running boards extend and retract
4. A fault is currently not present and may be an intermittent condition Circuit/System Testing C1180 or C1181
5. Ignition OFF, disconnect the in-line harness connector at the M95R Assist Step – Right.
6. Ignition ON
7. Test for 4.5 - 6.5 V between control circuit terminal 1 and ground. ⇒ If greater than 6.5 V 3.1. Ignition OFF, disconnect the X1 harness connector at the K4 Running Board Control Module, Ignition ON. 3.2. Test for less than 1 V between each control circuit and ground. ⇒ If 1 V or greater, repair the short to voltage on the circuit. ⇒ If less than 1 V, replace the K4 Assist Step Control Module. ⇒ If less than 4.5 V 3.1. Ignition OFF, disconnect the X1 harness connector at the K4 Running Board Control Module, ignition ON. 3.2. Test for infinite resistance between the control circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 3.3. Test for less than 2 Ω in the control circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K4 Running Board Control Module. ⇓ If between 4.5 - 6.5 V
8. Test for less than 1 V between control circuit terminal 5 and ground. ⇒ If greater than 1 V 4.1. Ignition OFF, disconnect the X1 harness connector at the K4 Running Board Control Module, Ignition ON. 4.2. Test for less than 1 V between each control circuit and ground. ⇒ If 1 V or greater, repair the short to voltage on the circuit. ⇒ If less than 1 V, replace the K4 Running Board Control Module. ⇓ If less than 1 V
9. Connect a test lamp between control circuit terminal 1 and the control circuit terminal 5.
10. Verify the test lamp turns on and off momentarily while commanding the M95R Assist Step – Right to Extend and Retract with a scan tool.

Note

The test lamp will momentarily light while toggling back and forth between Extend and Retract with a scan tool. After 4 tries, you must wait at least 10 s to repeat. ⇒ If the test lamp does not turn ON and OFF 6.1. Ignition OFF, disconnect the X1 harness connector at the K4 Running Board Control Module, ignition ON. 6.2. Test for infinite resistance between the control circuits. ⇒ If less than infinite resistance, repair the short between the circuits. ⇓ If infinite resistance 6.3. Test for infinite resistance between each control circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 6.4. Test for less than 2 Ω in each control circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K4 Running Board Control Module. ⇓ If the test lamp turns ON and OFF

7. Test or replace the M95R Assist Step – Right motor. C1182 or C1183
8. Ignition OFF, disconnect the in-line harness connector at the M95L Assist Step – Left.
9. Ignition ON
10. Test for 4.5 - 6.5 V between control circuit terminal 1 and ground. ⇒ If greater than 6.5 V 3.1. Ignition OFF, disconnect the X1 harness connector at the K4 Running Board Control Module, Ignition ON. 3.2. Test for less than 1 V between each control circuit and ground. ⇒ If 1 V or greater, repair the short to voltage on the circuit. ⇒ If less than 1 V, replace the K4 Running Board Control Module. ⇒ If less than 4.5 V 3.1. Ignition OFF, disconnect the X1 harness connector at the K4 Running Board Control Module, ignition ON. 3.2. Test for infinite resistance between the control circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 3.3. Test for less than 2 Ω in the control circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K4 Running Board Control Module. ⇓ If between 4.5 - 6.5 V
11. Test for less than 1 V between control circuit terminal 5 and ground. ⇒ If greater than 1 V 4.1. Ignition OFF, disconnect the X1 harness connector at the K4 Running Board Control Module, Ignition ON. 4.2. Test for less than 1 V between each control circuit and ground. ⇒ If 1 V or greater, repair the short to voltage on the circuit. ⇒ If less than 1 V, replace the K4 Running BoardControl Module. ⇓ If less than 1 V
12. Connect a test lamp between control circuit terminal 1 and the control circuit terminal 5.
13. Verify the test lamp turns on and off momentarily while commanding the M95R Assist Step – Right to Extend and Retract with a scan tool.

Note

The test lamp will momentarily light while toggling back and forth between Extend and Retract with a scan tool. After 4 tries, you must wait at least 10 s to repeat. ⇒ If the test lamp does not turn ON and OFF 6.1. Ignition OFF, disconnect the X1 harness connector at the K4 Running Board Control Module, ignition ON. 6.2. Test for infinite resistance between the control circuits. ⇒ If less than infinite resistance, repair the short between the circuits. ⇓ If infinite resistance 6.3. Test for infinite resistance between each control circuit and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance 6.4. Test for less than 2 Ω in each control circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇒ If less than 2 Ω, replace the K4 Running Board Control Module. ⇓ If the test lamp turns ON and OFF

7. Test or replace the M95L Assist Step – Left motor. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Assist Step Motor Replacement Control Module References for control module replacement, programming and setup.