Diagnostic Routine E
Diagnostic Routine E
Diagnostic Overview
No Power in ON-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
To place the vehicle in ON 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. When in ON mode, the BCM (Body Control Module) then activates the ignition relay and accessory relay, which distributes fused voltage to various components. The BCM (Body Control Module) uses a FET (Field-Effect Transistor) to control the relays. The ignition relay receives voltage from BJB (Battery Junction Box) fuse 23 (5A).
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.
The start/stop switch provides a voltage 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.
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
Inspect the battery and battery cables
Inspect high current BJB (Battery Junction Box) fuse 9 (50A)
Inspect BJB (Battery Junction Box) fuse 78 (5A)
Special Tool(s)
Pinpoint Test
1. CONFIRM THE IA (Intelligent Access) KEY ALLOWS VEHICLE ENTRY
1. NOTE: Do not place the IA (Intelligent Access) key inside the vehicle during this test step.
With the driver door unlocked and the IA (Intelligent Access) key within 1 m (3.28 ft) of the driver door, press the button on the driver door handle; the driver door should lock.
Did the driver door lock?
2. CHECK VEHICLE BATTERY
1. Carry out the Battery Condition Test. REFER to Diagnostic Routine A: Battery Condition Test Pinpoint Tests.
Is the battery OK?
3. CHECK FOR IGNITION ON MODE
1. NOTE: The air bag warning indicator in the IPC (Instrument Panel Cluster) only illuminates and proves out when the vehicle successfully enters ON mode.
Monitor the air bag warning indicator while attempting to enter ON mode.
Did the air bag warning indicator illuminate for approximately 6 seconds and then go out?
4. CHECK FOR VOLTAGE AT THE START/STOP SWITCH
1. Disconnect: Start-Stop Switch.
2. Measure:
Is the voltage greater than 11 volts?
5. CHECK FOR POWER TO BCM (Body Control Module) FUSE 78 (5A)
1. Verify BCM (Body Control Module) fuse 78 (5A) is installed.
2. Measure:
Is the voltage greater than 11 volts?
6. ATTEMPT VEHICLE START WHILE MONITORING THE MESSAGE CENTER
1. With the vehicle in PARK (automatic transmission) or NEUTRAL (automatic or manual transmission) and the IA (Intelligent Access) key in the vehicle, press the brake pedal (automatic transmission) or clutch pedal (manual transmission) and then press the start-stop switch while monitoring the message center.
Did the engine crank?
7. CARRY OUT A NETWORK TEST
1. Using the scan tool, carry out the network test.
Did the BCM (Body Control Module) pass the network test?
8. CHECK BCM (Body Control Module) DTCs (Diagnostic Trouble Codes)
1. Using the scan tool, perform the BCM (Body Control Module) self-test.
Are BCM (Body Control Module) DTCs (Diagnostic Trouble Codes) present?
9. CHECK FOR VOLTAGE AT THE BCM (Body Control Module)
1. Ignition OFF.
2. Disconnect: BCM (Body Control Module) C2280C.
3. Press and hold the start-stop switch.
4. Measure:
5. Release start-stop switch.
6. Measure:
Are the voltages of both circuits greater than 11 volts with the start-stop switch pressed and 0 volts when released?
10. CHECK THE IGNITION CIRCUITS FOR A SHORT TO VOLTAGE
1. Disconnect: Start-Stop Switch.
2. Measure:
Are any voltages present?
11. CHECK THE IGNITION CIRCUITS FOR AN OPEN
1. Disconnect: Start-Stop Switch.
2. Measure:
Are the resistances less than 3 ohms?
12. CHECK THE IGNITION CIRCUITS FOR A SHORT TO GROUND
1. Measure:
Are the resistances greater than 10,000 ohms?
13. CHECK THE IGNITION RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: Ignition Relay.
3. Disconnect: BCM (Body Control Module) C2280D.
4. Ignition ON.
5. Measure:
Is any voltage present?
14. CHECK THE IGNITION RELAY COIL VOLTAGE CIRCUIT
1. Ignition OFF.
2. Disconnect: Ignition Relay.
3. Measure:
Is the voltage greater than 11 volts?
15. CHECK THE IGNITION RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Disconnect: BCM (Body Control Module) C2280D.
2. Measure:
Is the resistance greater than 10,000 ohms?
16. CHECK THE IGNITION RELAY CONTROL CIRCUIT FOR AN OPEN
1. Measure:
Is the resistance less than 3 ohms?
17. CHECK THE ACCESSORY RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: Accessory Relay.
3. Disconnect: BCM (Body Control Module) C2280B.
4. Ignition ON.
5. Measure:
Is any voltage present?
18. CHECK THE KEY POSITION FOR IGNITION SWITCH STATE (IG_SW_ST) PID (Parameter Identification)
1. Using the scan tool, view the RFA (Remote Function Actuator) module PIDs (Parameter Identifications).
2. Monitor the RFA (Remote Function Actuator) module PID (Parameter Identification) IG_SW_ST.
3. Press and hold the start-stop switch.
Does the PID (Parameter Identification) read Pushed when the start-stop switch is pressed?
19. CHECK FOR VOLTAGE AT THE RFA (Remote Function Actuator) MODULE
1. Ignition OFF.
2. Disconnect: RFA (Remote Function Actuator) Module C4392D.
3. Press and hold the start-stop switch.
4. Measure:
Is the voltage greater than 11 volts?
20. CHECK THE IGNITION RELAY CONTACT VOLTAGE CIRCUIT
1. Ignition OFF.
2. Disconnect: Ignition Relay.
3. Measure:
Is the voltage greater than 11 volts?
21. CHECK VEHICLE OPTIONS
1. Check the vehicle for heated seats, roof opening panel, parking aid system and a rear view camera system.
Is the vehicle equipped with heated seats, roof opening panel, parking aid system and/or rear view camera system?
22. CHECK THE IGNITION RELAY VOLTAGE OUTPUT CIRCUIT FOR AN OPEN
1. Measure:
Is the resistance less than 3 ohms?
23. CHECK THE ACCESSORY RELAY COIL VOLTAGE CIRCUIT
1. Ignition OFF.
2. Disconnect: Accessory Relay.
3. Ignition ON.
4. Measure:
Are the voltages greater than 11 volts?
24. CHECK THE ACCESSORY RELAY
NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning of this system. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.
1. Measure:
Did the light illuminate?
25. CHECK THE ACCESSORY RELAY CONTROL CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Disconnect: BCM (Body Control Module) C2280B.
3. Measure:
Is the resistance less than 3 ohms?
26. 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?
27. CHECK FOR CORRECT RFA (Remote Function Actuator) MODULE OPERATION
1. Disconnect and inspect all RFA (Remote Function Actuator) 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 RFA (Remote Function Actuator) 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?
