DIAGNOSIS AND TESTING
B1016-REAR DEFROST SWITCH REQUEST INPUT CIRCUIT LOW (CCN)
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With ignition on, and the rear Defroster Grid activated.
- Set Condition:
When the Instrument Cluster (CCN) detects a low condition on the Rear Window Defogger Switch Signal circuit..
| Possible Causes |
| (C215) REAR WINDOW DEFOGGER SWITCH SIGNAL CIRCUIT SHORTED TO GROUND |
| INSTRUMENT CLUSTER (CCN) |
| HVAC CONTROL MODULE |
1. VERIFY REAR DEFROST SWITCH REQUEST INPUT CIRCUIT LOW IS ACTIVE
Turn the ignition on.
With the scan tool, check for DTCs.
Does the scan tool display this DTC as active?
Yes
- Go To2
No
- The condition that caused this symptom is currently not present. 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. Repair as necessary.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
2. CHECK FOR DTC WITH THE A/C HEATER CONTROL DISCONNECTED
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Using the scan tool, check for DTC's
Does the scan tool display this DTC as active?
Yes
- Go To 3
No
- Replace A/C Heater Control in accordance with the service information.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
3. CHECK THE (C215) REAR WINDOW DEFOGGER SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
Disconnect the Instrument Cluster (CCN) C3 harness connector.
Using an ohm meter measure the resistance from the (C215) Rear Window Defogger Switch Signal circuit to ground.
Does the ohm meter read open circuit?
Yes
- Replace the Instrument Cluster (CCN) in accordance with the service information.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Repair short to ground on the (C215) Rear Window Defogger Switch Signal circuit.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
B10C2 - REAR DEFROST SWITCH STUCK (CCN)
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
Continuously
- Set Condition:
When the Rear Defrost Switch in the Switch Bank is held in the On position for over 10 seconds, this code will set.
| Possible Causes |
| (D506) LIN BUS CIRCUIT SHORTED TO GROUND |
| SWITCH BANK STUCK |
| INSTRUMENT CLUSTER |
1. VERIFY DTC B10C2 – REAR DEFROST SWITCH STUCK IS ACTIVE
Turn the ignition on.
With the scan tool, check for DTCs.
Turn the ignition off, wait 10 seconds, and turn the ignition on.
Does the scan tool display this DTC as active?
Yes
- Go To2
No
- The condition that caused this symptom is currently not present. 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. Repair as necessary.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
2. CHECK FOR DTC B10C2 – REAR DEFROST SWITCH STUCK WITH SWITCH BANK (REAR DEFOGGER SWITCH) DISCONNECTED
Turn the ignition off.
With the scan tool, erase DTC's.
Disconnect the Switch Bank connector.
Turn the ignition on.
With the scan tool, read DTC's.
Does the scan tool display this code as active?
No
- Replace the Switch Bank in accordance with the service information.
- Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
Yes
- Go To 3
3. (D506) LIN BUS CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the Instrument Cluster (CCN) C2 harness connector.
Measure the resistance between ground and the (D506) LIN Bus circuit.
Does the ohm meter read open circuit?
Yes
- Replace the Instrument Cluster (CCN) in accordance with service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Repair the (D506) LIN Bus circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)