Diagnostic Routine E
Diagnostic Routine E
Diagnostic Overview
No Power in RUN-No Power in START - Vehicles with a Start-Stop Switch
Refer to Wiring Diagram Set 13 for schematic and connector information Electrical Diagrams.
Refer to Wiring Diagram Set 20 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
When in RUN mode, the BCM (Body Control Module) provides a ground for the coil (control) side of the RUN/START relay located in the BJB (Battery Junction Box). The BCM (Body Control Module) monitors the RUN/START relay control circuit; a DTC (Diagnostic Trouble Code) sets if the circuit is shorted to ground or open.
The start/stop switch provides a voltage and ground input to the BCM (Body Control Module), the RFA (Remote Function Actuator) module and the PCM (Powertrain Control Module). The 3 modules exchange information over the HS-CAN (High Speed Controller Area Network) to determine if starting the engine is authorized. If the PATS (Passive Anti-Theft System) authorizes the starting of the engine, the PCM (Powertrain Control Module) supplies power and ground to the starter relay.
To place the vehicle in RUN mode, locate the IA (Intelligent Access) key inside the vehicle and press the start/stop switch once, for at least one second, without applying the brake pedal. To start the engine, locate the IA (Intelligent Access) key inside the vehicle and press the start/stop switch while the brake pedal is applied.
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
Make sure the battery and battery cables are OK.
Make sure high current BJB (Battery Junction Box) fuse B (100A) is OK.
Make sure BJB (Battery Junction Box) fuse 87 (5A) is OK.
Make sure BJB (Battery Junction Box) fuse 59 (10A) is OK.
Pinpoint Test
1. CHECK THE BCM (Body Control Module) BATTERY FEED CIRCUIT FOR AN OPEN
1. Disconnect: BCM (Body Control Module) C2280G.
2. Measure:
Is the voltage greater than 11 volts?
2. CONFIRM THE IA (Intelligent Access) KEY ALLOWS VEHICLE ENTRY
1. Connect: BCM (Body Control Module) C2280G.
2. NOTE: Verify that the IA (Intelligent Access) key is not inside the vehicle before proceeding with this step.
With the driver door locked and the IA (Intelligent Access) key within 1 m (3.28 ft) of the driver door, grab the driver door handle. The driver door handle is equipped with capacitive touch sensors to lock and unlock the door.
Did the driver door unlock?
3. CHECK THE VEHICLE BATTERY
1. Carry out the Battery Condition Test. REFER to Diagnostic Routine A: Battery Condition Test Pinpoint Tests.
Is the battery OK?
4. ATTEMPT VEHICLE START WHILE MONITORING MESSAGE CENTER
1. With the vehicle in PARK and the IA (Intelligent Access) key in the vehicle, press and hold the brake pedal, then press the start/stop switch while monitoring message center messages.
Did the engine crank?
5. CARRY OUT A RFA (Remote Function Actuator) MODULE SELF-TEST
1. NOTE: The RFA (Remote Function Actuator) module is able to carry out a self-test with the ignition in the OFF mode. When the scan tool indicates "Turn the Ignition ON" or "Ignition ON", ignore this command and press or click the "continue" button.
NOTE: RFA (Remote Function Actuator) module communication is indicated by the completion of the self-test.
Using a scan tool, perform RFA (Remote Function Actuator) module self-test to retrieve DTCs (Diagnostic Trouble Codes).
Did the RFA (Remote Function Actuator) module communicate with the scan tool?
6. ACT ON RFA (Remote Function Actuator) MODULE DTCs (Diagnostic Trouble Codes)
1. Refer to the results of the RFA (Remote Function Actuator) module self-test.
Are any start/stop switch DTCs (Diagnostic Trouble Codes) and/or BCM (Body Control Module) communication DTCs (Diagnostic Trouble Codes) present in the RFA (Remote Function Actuator) module?
7. CHECK FOR IGNITION RUN MODE
1. NOTE: The air bag warning indicator in the IPC (Instrument Panel Cluster) illuminates and proves out only if the ignition successfully enters RUN mode.
With the IA (Intelligent Access) key still in the vehicle, monitor the air bag warning indicator in the IPC (Instrument Panel Cluster) while pressing the start/stop switch for at least one second.
Did the air bag warning indicator illuminate for approximately 6 seconds and then go out?
8. ISOLATE THE RUN/START RELAY
1. Disconnect: RUN/START Relay.
2. Carry out the appropriate relay component test.
Is the relay OK?
9. CHECK THE RUN/START RELAY OUTPUT CIRCUIT FOR AN OPEN
1. Disconnect: BCM (Body Control Module) C2280E.
2. Measure:
Is the resistance less than 3 ohms?
10. CHECK FOR POWER TO THE RUN/START RELAY
1. Measure:
Is the voltage greater than 11 volts?
11. CHECK THE RUN/START RELAY CONTROL CIRCUIT FOR AN OPEN
1. Disconnect: BCM (Battery Control Module) C2280F.
2. Measure:
Is the resistance less than 3 ohms?
12. CHECK FOR POWER TO THE STOPLAMP SWITCH
1. Disconnect: Stoplamp Switch.
2. Measure:
Is the voltage greater than 11 volts?
13. CHECK THE STOPLAMP SWITCH INPUT TO THE BCM (Body Control Module) FOR AN OPEN
1. Disconnect: BCM (Body Control Module) C2280B.
2. Measure:
Is the resistance less than 3 ohms?
14. CHECK FOR CORRECT BCM (Body Control Module) OPERATION
1. Disconnect and inspect all BCM (Body Control Module) connectors.
2. Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
3. Reconnect the BCM (Body Control Module) connectors and all previously disconnected exterior system connectors. Make sure they seat and latch correctly.
4. Operate the system and determine if the concern is still present.
Is the concern still present?
