Diagnostic Routine D
Diagnostic Routine D
Diagnostic Overview
The Vehicle Does Not Start With the Intelligent Access (IA) Key in Certain Areas of the Vehicle
Refer to Wiring Diagram Set 112 for schematic and connector information Electrical Diagrams.
Normal Operations and Fault Conditions
During each vehicle start sequence, when the start/stop button is pressed, the RFA (Remote Function Actuator) module activates all 3 passive start antennas, which send out a low frequency signal. Each passive start antenna has an approximate range of 1 m (3 ft) and are placed in different locations to provide full coverage inside the vehicle. If an IA (Intelligent Access) key is within range of a passive start antenna, the low frequency signal activates the IA (Intelligent Access) key. When the IA (Intelligent Access) key is activated it sends a high frequency signal to the RFR (Remote Functions Receiver) module. The RFR (Remote Functions Receiver) module communicates with the RFA (Remote Function Actuator) module. If the RFA (Remote Function Actuator) module determines that a programmed IA (Intelligent Access) key is in the vehicle, it allows the ignition to transition out of off or lets the engine start.
There are certain areas inside the vehicle where the IA (Intelligent Access) key may not be detected and the message center displays Key not detected. If the IA (Intelligent Access) key is at the outer edges of the interior (like in a door map pocket or above a sun visor) it might not be detected. Move the IA (Intelligent Access) key to a different location and try to start the vehicle again.
NOTE: Some brands/types of mobile phone or laptop computer chargers may cause interference that could lead to a PATS (Passive Anti-Theft System) no-start if the IA (Intelligent Access) key is within a few inches of the charger. If a concern is observed, move the IA (Intelligent Access) key away from the charger and attempt to start the vehicle.
DTC Fault Trigger Conditions
Pinpoint Test
1. CHECK THE IA (Intelligent Access) KEY LOCATION
1. Check the location of the IA (Intelligent Access) key and if it is placed in the far corners of the interior of the vehicle, move the IA (Intelligent Access) key out of these areas and attempt to start the vehicle.
Does the vehicle start?
2. CHECK FOR ENVIRONMENTAL INTERFERENCE
1. Check for the use of any charger or other wireless device that can cause interference with the IA (Intelligent Access) key. If any device is found, remove the device and attempt to start the engine.
Does the engine start?
3. CHECK THE SUSPECT PASSIVE START ANTENNA
1. Ignition OFF.
2. Disconnect: Suspect Passive Start Antenna.
3. For a front antenna, measure:
4. For a center antenna, measure:
5. For a rear antenna, measure:
Is the resistance between 1 and 3 ohms?
4. CHECK THE PASSIVE START ANTENNA CIRCUITS FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: RFA module C4392A.
3. Disconnect: RFA module C4392B.
4. Place an IA (Intelligent Access) key in the backup slot and press the START/STOP switch to switch the ignition to ON.
5. For a front antenna, measure:
6. For a center antenna, measure:
7. For a rear antenna, measure:
Is any voltage present?
5. CHECK THE PASSIVE START ANTENNA CIRCUITS FOR A SHORT TO GROUND
1. Ignition OFF.
2. For a front antenna, measure:
3. For a center antenna, measure:
4. For a rear antenna, measure:
Are the resistances greater than 10,000 ohms?
6. CHECK THE ANTENNA CIRCUITS FOR AN OPEN
1. For a front antenna, measure:
2. For a center antenna, measure:
3. For a rear antenna, measure:
Are the resistances less than 3 ohms?
7. CHECK FOR CORRECT RFA (Remote Function Actuator) MODULE OPERATION
1. Ignition OFF.
2. Disconnect and inspect all RFA (Remote Function Actuator) module connectors.
3. Repair:
- corrosion, (install new connectors or terminals- clean module pins)
- damaged or bent pins- install new terminals pins
- pushed-out pins- install new pins as necessary
4. Reconnect all the RFA (Remote Function Actuator) module connectors and make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present.
Is the concern still present?
