Cabin Compartment Node (Ccn) - Electrical Diagnostics: Diagnosis RAM Pickup 2500

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Scheme 1

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Diagnostic Test

1. INSPECT SWITCH BANK FOR DAMAGE NOTE: Diagnose and repair all LIN Bus related DTCs before performing this test procedure. Turn the ignition off. Inspect the Switch Bank for damage. Is the Switch Bank damaged? Yes Replace the Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 No Go To 2 .
2. INSPECT FOR OBJECT OR SUBSTANCE CAUSING LEFT HEATED SEAT SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the Left Heated Seat switch for anything that would cause it to stay or stick in a pushed position. Is anything present that would cause the Left Heated Seat switch to stay or stick in a pushed position? Yes Repair as necessary. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 No Go To 3 .
3. TEST FOR INTERMITTENT CONDITION Turn the ignition on. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs). Press and release the Left Heated Seat switch several times and then wait 20 seconds. Using a scan tool, read DTCs. Does the scan tool display DTC B10BB-LEFT HEATED SEAT SWITCH INPUT CIRCUIT STUCK? Yes Replace the Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No The conditions that caused this code to set are not present at this time. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.

1. INSPECT SWITCH BANK FOR DAMAGE NOTE: Diagnose and repair all LIN Bus related DTCs before performing this test procedure. Turn the ignition off. Inspect the Switch Bank for damage. Is the Switch Bank damaged? Yes Replace the Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 No Go To 2 .
2. INSPECT FOR OBJECT OR SUBSTANCE CAUSING RIGHT HEATED SEAT SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the Right Heated Seat switch for anything that would cause it to stay or stick in a pushed position. Is anything present that would cause the Right Heated Seat switch to stay or stick in a pushed position? Yes Repair as necessary. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 No Go To 3 .
3. TEST FOR INTERMITTENT CONDITION Turn the ignition on. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs). Press and release the Right Heated Seat switch several times and then wait 20 seconds. Using a scan tool, read DTCs. Does the scan tool display DTC B10BC-RIGHT HEATED SEAT SWITCH INPUT CIRCUIT STUCK? Yes Replace the Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 No The conditions that caused this code to set are not present at this time. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500

Scheme 2

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Compass Module in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete.

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Upper Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete.

1. CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic procedure, verify the Left and Right Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Right Steering Wheel Switch in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

1. CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic procedure, verify the Left and Right Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Right Steering Wheel Switch in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Cluster in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete.

Scheme 3

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic procedure, verify the Left and Right Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Left Steering Wheel Switch in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

1. CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic procedure, verify the Left and Right Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Left Steering Wheel Switch in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

Scheme 4

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. TEST FOR INTERMITTENT CONDITION Turn the ignition on. Turn the Headlamps on. Operate the Fog Lamp Switch several times. Turn the ignition on and wait 30 seconds. Using the scan tool, read DTCs. Does the scan tool display: B168F-FRONT FOG LAMP SWITCH CIRCUIT STUCK? Yes Replace the Headlamp Switch in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

Scheme 5

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic procedure, verify the Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. Actuate the left and right turn signals with the Multifunction Switch. With the scan tool, read DTCs. Does the scan tool display this DTC as Active? Yes Replace the Multifunction Switch in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

1. CHECK FOR AN ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Before proceeding with this diagnostic procedure, verify the Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. Turn the Wipers on and off three times. Using the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Multifunction Switch in accordance with the Service Information. Refer to «SWITCH, Multifunction , Removal»(ref-457789-S31931805052012030200000) . Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

1. CHECK FOR AN ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) NOTE: Before proceeding with this diagnostic procedure, verify the Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. Actuate the Washer Switch. Using the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Multifunction Switch in accordance with the Service Information. Refer to «SWITCH, Multifunction , Removal»(ref-457789-S31931805052012030200000) . Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

Scheme 6

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic procedure, verify the Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. Actuate the High Beams with the Multifunction Switch. With the scan tool, read DTCs. Does the scan tool display this DTC as Active? Yes Replace the Multifunction Switch in accordance with the Service Information. Refer to «SWITCH, Multifunction , Removal»(ref-457789-S31931805052012030200000) . Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

1. CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic procedure, verify the Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. Actuate the Mist function with the Multifunction Switch. With the scan tool, read DTCs. Does the scan tool display this DTC as Active? Yes Replace the Multifunction Switch in accordance with the Service Information. Refer to «SWITCH, Multifunction , Removal»(ref-457789-S31931805052012030200000) . Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

1. CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic procedure, verify the Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. Actuate the Optical Horn with the Multifunction Switch. With the scan tool, read DTCs. Does the scan tool display this DTC as Active? Yes Replace the Multifunction Switch in accordance with the Service Information. Refer to «SWITCH, Multifunction , Removal»(ref-457789-S31931805052012030200000) . Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. Press the Tire Pressure Load (Light Load) Switch several times. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Upper Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Replace the Upper Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete.

Scheme 7

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. Actuate the Overdrive / Tow Switch. With the scan tool, read DTCs. Does the scan tool display this DTC as Active? Yes Replace the Upper Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete.

Scheme 8

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. INSPECT SWITCH BANK FOR DAMAGE NOTE: Diagnose and repair all LIN Bus related DTCs before performing this test procedure. Turn the ignition off. Inspect the Switch Bank for damage. Is the Switch Bank damaged? Yes Replace the Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 No Go To 2 .
2. INSPECT FOR OBJECT OR SUBSTANCE CAUSING INVERTER SWITCH TO STAY OR STICK IN A PUSHED POSITION Inspect the Inverter switch for anything that would cause it to stay or stick in a pushed position. Is anything present that would cause the Inverter switch to stay or stick in a pushed position? Yes Repair as necessary. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Go To 3 .
3. TEST FOR INTERMITTENT CONDITION Turn the ignition on. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs). Press and release the Inverter switch several times and then wait 20 seconds. Using a scan tool, read DTCs. Does the scan tool display DTC P1103-DC TO AC CONVERTER SWITCH STUCK? Yes Replace the Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.

1. VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. Using the scan tool, read active DTCs. Is this DTC active? Yes Refer to «U0010-CAN INTERIOR BUS»(ref-457926-S01022139122012030200000) for 1500, 2500 & 3500 or «U0010-CAN INTERIOR BUS»(ref-457927-S08979577912012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. and perform the U0010-CAN Interior Bus diagnostic procedure. No Perform the «STORED LOST COMMUNICATION DTCS»(ref-457934-S05707347042012030200000) for 1500, 2500 and 3500, or «STORED LOST COMMUNICATION DTCS»(ref-457935-S26988435972012030200000) for 3500 Cab & Chassis, 4500 and 5500 diagnostic procedure.

1. VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active Cluster DTCs. Is this DTC active? Yes Refer to «U0141-LOST COMMUNICATION WITH IPM (FCM/TIPM)»(ref-457926-S24039559512012030200000) for 1500, 2500 & 3500 or «U0141-LOST COMMUNICATION WITH IPM (FCM/TIPM)»(ref-457927-S04407950332012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 and perform the U0141-Lost Communication with IPM (FCM/TIPM) diagnostic procedure. No Perform the «STORED LOST COMMUNICATION DTCS»(ref-457934-S05707347042012030200000) for 1500, 2500 and 3500, or «STORED LOST COMMUNICATION DTCS»(ref-457935-S26988435972012030200000) for 3500 Cab & Chassis, 4500 and 5500 diagnostic procedure.

1. VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active Cluster DTCs. Is this DTC active? Yes Refer to «U0159-LOST COMMUNICATION WITH PARK ASSIST MODULE (PTS)»(ref-457926-S06760629892012030200000) for 1500, 2500 & 3500 or «DIAGNOSIS AND TESTING»(ref-457927-S29008752792012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 and perform the U0159-Lost Communication with Park Assist Control Module diagnostic procedure. No Perform the «STORED LOST COMMUNICATION DTCS»(ref-457934-S05707347042012030200000) for 1500, 2500 and 3500, or «STORED LOST COMMUNICATION DTCS»(ref-457935-S26988435972012030200000) for 3500 Cab & Chassis, 4500 and 5500 diagnostic procedure.

Scheme 9

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, record and erase DTCs. Wait 30 seconds. With the scan tool, read DTCs. Does the scan tool display: U0161-LOST COMMUNICATION WITH COMPASS MODULE? Yes Go To 2 . No The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
2. (D506) LIN BUS CIRCUIT OPEN Turn the ignition off. Disconnect the Compass Module harness connector. Turn the ignition on. Measure the voltage of the (D506) LIN BUS circuit. Is the voltage above 5 volts? Yes Go To 4 . No Go To 3 .
3. (D506) LIN BUS CIRCUIT OPEN Turn the ignition off. Disconnect the Cluster C3 harness connector. Measure the resistance of the (D506) LIN BUS circuit. Is the resistance below 10K Ohms? Yes Replace the Cluster in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Repair the (D506) LIN BUS circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
4. (A416) FUSED B(+) CIRCUIT OPEN Turn the ignition on. Measure the voltage of the (A416) Fused B(+) circuit. Is the voltage above 10 volts? Yes Go To 5 . No Repair the (A416) Fused B(+) circuit for an open. Inspect the related fuse. If the fuse is open, check the circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
5. (Z906) GROUND CIRCUIT OPEN Turn the ignition off. Measure the resistance between ground and the (Z906) Ground circuit. Is the resistance below 10K Ohms? Yes Replace the Compass Module in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Repair the (Z906) ground circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.

1. VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active Cluster DTCs. Is this DTC active? Yes Refer to «U0164-LOST COMMUNICATION WITH HVAC CONTROL MODULE»(ref-457926-S26422729642012030200000) for 1500, 2500 & 3500 or «U0164-LOST COMMUNICATION WITH HVAC CONTROL MODULE»(ref-457927-S00892400212012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 and perform the U0164-Lost Communication with HVAC Control Module diagnostic procedure. No Perform the «STORED LOST COMMUNICATION DTCS»(ref-457934-S05707347042012030200000) for 1500, 2500 and 3500, or «STORED LOST COMMUNICATION DTCS»(ref-457935-S26988435972012030200000) for 3500 Cab & Chassis, 4500 and 5500 diagnostic procedure.

1. VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active Cluster DTCs. Is this DTC active? Yes Refer to «U0184-LOST COMMUNICATION WITH RADIO»(ref-457926-S04072053652012030200000) for 1500, 2500 & 3500 or «U0184-LOST COMMUNICATION WITH RADIO»(ref-457927-S32606774262012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 and perform the U0184-Lost Communication with Radio diagnostic procedure. No Perform the «STORED LOST COMMUNICATION DTCS»(ref-457934-S05707347042012030200000) for 1500, 2500 and 3500, or «STORED LOST COMMUNICATION DTCS»(ref-457935-S26988435972012030200000) for 3500 Cab & Chassis, 4500 and 5500 diagnostic procedure.

1. VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active Cluster DTCs. Is this DTC active? Yes Refer to «U0197-LOST COMMUNICATION WITH HANDS FREE PHONE MODULE (HFM)»(ref-457926-S28912296972012030200000) for 1500, 2500 & 3500 or «U0197-LOST COMMUNICATION WITH HANDS FREE PHONE MODULE (HFM)»(ref-457927-S08480747862012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 and perform the U0197-Lost Communication with Hands Free Module diagnostic procedure. No Perform the «STORED LOST COMMUNICATION DTCS»(ref-457934-S05707347042012030200000) for 1500, 2500 and 3500, or «STORED LOST COMMUNICATION DTCS»(ref-457935-S26988435972012030200000) for 3500 Cab & Chassis, 4500 and 5500 diagnostic procedure.

1. VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active Cluster DTCs. Is this DTC active? Yes Refer to «U0208-LOST COMMUNICATION WITH HEATED SEAT CONTROL MODULE»(ref-457926-S40826584682012030200000) for 1500, 2500 & 3500 or «U0208-LOST COMMUNICATION WITH HEATED SEAT CONTROL MODULE»(ref-457927-S40366101892012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 and perform the U0208-Lost Communication with Heated Seat Control Module diagnostic procedure. No Perform the «STORED LOST COMMUNICATION DTCS»(ref-457934-S05707347042012030200000) for 1500, 2500 and 3500, or «STORED LOST COMMUNICATION DTCS»(ref-457935-S26988435972012030200000) for 3500 Cab & Chassis, 4500 and 5500 diagnostic procedure.

1. VERIFY DIAGNOSTIC TROUBLE CODE (DTC) IS ACTIVE NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. With the scan tool, read active Cluster DTCs. Is this DTC active? Yes Refer to «U0209-LOST COMMUNICATION WITH MEMORY SEAT CONTROL MODULE (MSMD)»(ref-457926-S23066817092012030200000) for 1500, 2500 & 3500 or «U0209-LOST COMMUNICATION WITH MEMORY SEAT CONTROL MODULE (MSMD)»(ref-457927-S04176796582012030200000) for 3500 CAB & CHASSIS, 4500 & 5500 and perform the U0209-Lost Communication with Memory Seat Control Module diagnostic procedure. . No Perform the «STORED LOST COMMUNICATION DTCS»(ref-457934-S05707347042012030200000) for 1500, 2500 and 3500, or «STORED LOST COMMUNICATION DTCS»(ref-457935-S26988435972012030200000) for 3500 Cab & Chassis, 4500 and 5500 diagnostic procedure.

Scheme 10

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic procedure, verify the Left and Right Multifunction Switch and Clockspring harness connectors are properly seated and verify proper pin terminal tension. A loose connection at any of these connectors may cause this DTC to set. Turn the ignition on. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
2. (A909) FUSED B (+) CIRCUIT OPEN Turn the ignition off. Disconnect the Right Steering Wheel Switch harness connector. Turn the ignition on. Measure the voltage of the (A909) Fused B (+) circuit. Is the voltage above 10.0 volts? Yes Go To 3 . No Using the Wiring Information as a guide, repair the (A909) Fused B (+) circuit for an open. Inspect the related fuse. If the fuse is open, check the circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
3. (Z911) GROUND CIRCUIT OPEN Turn the ignition off. Measure the resistance between ground and the (Z911) Ground circuit at the Right Steering Wheel Switch harness connector. Is the resistance below 10K Ohms? Yes Go To 4 . No Using the Wiring Information as a guide, repair the (Z911) Ground circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
4. RIGHT STEERING WHEEL SWITCH Turn the ignition on. Measure the voltage of the (D506) LIN BUS circuit at the Right Steering Wheel Switch harness connector. Is the voltage above 5 volts? Yes Replace the Right Steering Wheel Switch in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Go To 5 .
5. (D506) LIN BUS CIRCUIT OPEN BETWEEN THE CLOCKSPRING AND RIGHT STEERING WHEEL SWITCH Turn the ignition off. Disconnect the Clockspring C8 harness connector. Measure the resistance of the (D506) LIN BUS circuit between the Clockspring C8 and Right Steering Wheel Switch harness connectors. Is the resistance below 10K Ohms? Yes Go To 6 . No Repair the (D506) LIN BUS circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
6. CLOCKSPRING Disconnect the Clockspring C2 harness connector. Turn the ignition on. Measure the voltage of the (D506) LIN BUS circuit at the Clockspring C2 harness connector. Is the voltage above 5 volts? Yes Replace the Clockspring in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Go To 7 .
7. (D506) LIN BUS CIRCUIT OPEN BETWEEN THE CLUSTER AND THE CLOCKSPRING Turn the ignition off. Disconnect the Cluster C3 harness connector. Measure the resistance of the (D506) LIN BUS circuit between the Clockspring C2 and Cluster C3 harness connectors. Is the resistance below 10K Ohms? Yes Replace the Cluster in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Repair the (D506) LIN BUS circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.

Scheme 11

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. CHECK FOR AN ACTIVE DTC NOTE: Before proceeding with this diagnostic process, verify the proper connection of the Multifunction Switch harness connector. A loose connection at this connector will cause this DTC to set. Turn the ignition off. Gently pull the Multifunction Switch connector harness to verify the locking tab is fully engaged. If the connector locking tab is not fully engaged, push to seat the connector locking tab. Turn the ignition on. Wait 30 seconds. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
2. (D506) LIN BUS CIRCUIT OPEN Turn the ignition off. Disconnect the Multifunction Switch harness connector. Turn the ignition on. Measure the voltage of the (D506) LIN BUS circuit. Is the voltage above 5 volts? Yes Go To 3 . No Repair the (D506) LIN BUS circuit for an open Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
3. (F943) FUSED IGNITION RUN/START CONTROL OUTPUT CIRCUIT OPEN Measure the voltage of the (F943) Fused Ignition Run/Start Control Output circuit. Is the voltage above 10 volts? Yes Go To 4 . No Repair the (F943) Fused Ignition Run/Start Control Output circuit for an open. Inspect the related fuse. If the fuse is open, check the circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
4. (A412) FUSED B(+) (I.O.D.) CIRCUIT OPEN Measure the voltage of the (A412) Fused B(+) (I.O.D.) circuit. Is the voltage above 10 volts? Yes Go To 5 . No Repair the (A412) Fused B(+) (I.O.D.) circuit for an open. Inspect the related fuse. If the fuse is open, check the circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
5. (Z911) GROUND CIRCUIT OPEN Turn the ignition off. Measure the resistance between ground and the (Z911) Ground circuit. Is the resistance below 10K Ohms? Yes Replace the Multifunction Switch in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Repair the (Z911) Ground circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.

Scheme 12

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, record and erase DTCs. Wait 30 seconds. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
2. (D506) LIN BUS CIRCUIT OPEN Turn the ignition off. Disconnect the Upper Switch Bank harness connector. Turn the ignition on. Measure the voltage of the (D506) LIN BUS circuit. Is the voltage above 5 volts? Yes Go To 4 . No Go To 3 .
3. (D506) LIN BUS CIRCUIT OPEN Turn the ignition off. Disconnect the Instrument Cluster C3 harness connector. Measure the resistance of the (D506) LIN BUS circuit between the Cluster C3 and the Upper Switch Bank harness connectors. Is the resistance below 10K Ohms? Yes Replace the Cluster in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Repair the (D506) LIN BUS circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
4. (A909) FUSED B+ CIRCUIT OPEN Turn the ignition on. Using a 12-volt test light connected to ground, check the (A909) Fused B+ circuit at the Upper Switch Bank harness connector. Does the test light illuminate brightly? Yes Go To 5 . No Repair the (A909) Fused B+ circuit for an open. Inspect the related fuse. If the fuse is open, check the circuit for a short to ground. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
5. (Z911) GROUND CIRCUIT OPEN Turn the ignition off. Using a 12-volt test light connected to 12-volts, check the (Z911) Ground circuit at the Upper Switch Bank harness connector. Does the test light illuminate brightly? Yes Replace the Upper Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Repair the (Z911) ground circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.

Scheme 13

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, record and erase DTCs. Wait 30 seconds. With the scan tool, read DTCs. Does the scan tool display this DTC as active? Yes Go To 2 . No The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
2. (D506) LIN BUS CIRCUIT OPEN Turn the ignition off. Disconnect the Lower Switch Bank harness connector. Turn the ignition on. Measure the voltage of the (D506) LIN BUS circuit. Is the voltage above 5 volts? Yes Go To 4 . No Go To 3 .
3. (D506) LIN BUS CIRCUIT OPEN Turn the ignition off. Disconnect the Instrument Cluster C3 harness connector. Measure the resistance of the (D506) LIN BUS circuit between the Cluster C3 and the Lower Switch Bank harness connectors. Is the resistance below 10K Ohms? Yes Replace the Cluster in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Repair the (D506) LIN BUS circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
4. (A909) FUSED B+ CIRCUIT OPEN Turn the ignition on. Using a 12-volt test light connected to ground, check the (A909) Fused B+ circuit at the Lower Switch Bank harness connector. Does the test light illuminate brightly? Yes Go To 5 . No Repair the (A909) Fused B+ circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.
5. (Z911) GROUND CIRCUIT OPEN Turn the ignition off. Using a 12-volt test light connected to 12-volts, check the (Z911) Ground circuit at the Lower Switch Bank harness connector. Does the test light illuminate brightly? Yes Replace the Lower Switch Bank in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500. No Repair the (Z911) ground circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-457926-S40044966262012030200000) for 1500, 2500 & 3500, or «BODY VERIFICATION TEST»(ref-457927-S20352278932012030200000) for 3500 CAB & CHASSIS, 4500 & 5500.