B160B-PANEL DIMMER INPUT CIRCUIT HIGH RAM Cab & Chassis 3500 HD

B160B-PANEL DIMMER INPUT CIRCUIT HIGH

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

With the ignition on.

Panel Dimmer signal is greater than 4.8 volts.

Scheme 407

Scheme 408

Scheme 409

1. CHECK FOR AN ACTIVE DTC Turn the ignition on. With the scan tool, record and erase DTCs. Activate the Panel Dimmer Switch. Wait 30 seconds. With the scan tool, read DTCs. Is the DTC 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-476553-S41648749512012060400000) .
2. CHECK THE (E2) PANEL LAMPS DIMMER SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Turn the ignition off. Disconnect the Headlamp Switch harness connectors. Turn the ignition on. Measure the voltage on the (E2) Panel Lamps Dimmer Signal circuit. Is the voltage greater than 10.0 volts? Yes Repair the (E2) Panel Lamps Dimmer Signal circuit for a short to voltage. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-476553-S41648749512012060400000) . No Go To 3 .
3. CHECK THE OPERATION OF THE PANEL LAMPS DIMMER SWITCH Turn the ignition off. Connect a jumper wire at the Headlamp Switch harness connector between the (E2) Panel Lamps Dimmer Signal circuit and ground. Turn the ignition on. With the scan tool, read DTCs. Does the Scan tool display-B160A-PANEL DIMMER INPUT CIRCUIT LOW? Yes Replace the Headlamp Switch in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-476553-S41648749512012060400000) . No Go To 4 .
4. CHECK THE (E2) PANEL LAMPS DIMMER SIGNAL CIRCUIT FOR AN OPEN Turn the ignition off. Disconnect the Cluster C3 harness connector. Measure the resistance of the (E2) Panel Lamps Dimmer Signal circuit between the Cluster C3 harness connector and the Headlamp Switch harness connector. Is the resistance above 5.0 Ohms? Yes Repair the (E2) Panel Lamps Dimmer Signal circuit for an open. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-476553-S41648749512012060400000) . No Replace the Cluster in accordance with the Service Information. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-476553-S41648749512012060400000) .

Scheme 410

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

With the ignition on, Cargo Lamp activated.

The Cluster detects the Cargo Lamp Driver circuit is open.

Scheme 411

Scheme 412

Scheme 413

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 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-476553-S41648749512012060400000) .
2. CENTER HIGH MOUNTED STOP/CARGO LAMP Disconnect the Center High Mounted Stop/Cargo Lamp harness connector. Turn the Cargo Lamp on. Using a test light, measure the voltage across the (L14) Cargo Lamp Driver circuit and (Z905) Ground circuits at the Center High Mounted Stop/Cargo Lamp harness connector. Does the test light illuminate? Yes Replace the Cargo Lamp in accordance with the Service Information. Refer to «LAMP, CARGO, REMOVAL»(ref-476552-S24277716692012060400000) . Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-476553-S41648749512012060400000) . No Go To 3 .
3. (Z905) GROUND CIRCUIT FOR AN OPEN Turn the ignition off. Using a test light connected to 12 volts, measure the resistance to ground of the (Z905) Ground circuit at the Center High Mounted Stop/Cargo Lamp harness connector. Does the test light illuminate? Yes Go To 4 . No Repair the open in the (Z905) Ground circuit. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-476553-S41648749512012060400000) .
4. (L14) CARGO LAMP DRIVER CIRCUIT FOR AN OPEN Disconnect the Cluster C1 harness connector. Measure the resistance of the (L14) Cargo Lamp Driver circuit. Is the resistance below 5.0 Ohms? Yes Replace the Cluster in accordance with the service information. Refer to «REMOVAL»(ref-476514-S25394978592012060400000) . Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-476553-S41648749512012060400000) . No Repair the open in the (L14) Cargo Lamp Driver circuit. Perform the BODY VERIFICATION TEST. Refer to «BODY VERIFICATION TEST»(ref-476553-S41648749512012060400000) .