Keyless Entry System and Remote Functions: Diagnosis Chevrolet Sonic I

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(ref-542476-S03610919532013041600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-542476-S11988299792013041600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-542476-S27446858652013041600000) provides an overview of each diagnostic category.

DTC Descriptor

For symptom byte information, refer to Symptom Byte List .

Diagnostic Fault Information

Conditions for Running the DTC

The body control module monitors for this DTC at all times.

Conditions for Setting the DTC

No response is received from the remote control door lock receiver after the body control module requests information from or sends configuration commands to the remote control door lock receiver.

Action Taken When the DTC Sets

In the case of power loss, the remote control door lock receiver is disabled for 65 s. Otherwise no action is taken.

Conditions for Clearing the DTC

1. A current DTC will clear when the fault is no longer present.
2. A history DTC will clear after 40 consecutive ignition cycles without a fault present.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, scan tool disconnected, disconnect the harness connector at the K77 Remote Control Door Lock Receiver. It may take up to 2 min for all vehicle systems to power down.
2. Test for less than 30 ohms between the low reference circuit terminal 1 and ground. If 30 ohms or greater Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for less than 2 ohms in the low reference circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If less than 30 ohms
3. Ignition ON.
4. Test for greater than 11.5 V between the B+ circuit terminal 4 and ground. If 11.5 V or less Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If Infinite resistance. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If greater than 11.5 V
5. Test for 1-6 V between the serial data circuit terminal 2 and ground. If less than 1 V Ignition OFF, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the serial data circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the serial data circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K9 Body Control Module. If greater than 6 V Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the serial data circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. If between 3-6 V
6. Ignition OFF, disconnect the X1 and X2 harness connectors at the K9 Body Control Module, ignition ON.
7. Test for less than 1 V between the K9 Body Control Module serial data circuit terminal 26 X1 and ground. If 1 V or greater Repair the short to voltage on the circuit. If less than 1 V
8. Ignition OFF.
9. Test for infinite resistance between the K9 Body Control Module serial data circuit terminal 26 X1 and ground. If less than infinite resistance Repair the short to ground on the circuit. If infinite resistance
10. Test for less than 2 ohms between the K9 Body Control Module serial data circuit terminal 26 X1 and the K77 Remote Control Door Lock Receiver serial data circuit terminal 3. If 2 ohms or greater Repair the open/high resistance in the circuit. If less than 2 ohms
11. Replace the K77 Remote Control Door Lock Receiver.
12. Verify DTC B3101 does not set while operating the vehicle under the conditions for running the DTC. If the DTC sets Replace the K9 Body Control Module If the DTC does not set
13. All OK.

1. Perform the «Diagnostic System Check - Vehicle»(ref-542476-S03610919532013041600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-542476-S11988299792013041600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-542476-S27446858652013041600000) provides an overview of each diagnostic category.

For symptom byte information, refer to Symptom Byte List .

The body control module has been set up without transmitters being programmed.

No keyless entry transmitter programmed to the body control module.

The keyless entry system is inoperative.

A current DTC is cleared when at least one transmitter has been programmed to the body control module.

1. Perform the «Diagnostic System Check - Vehicle»(ref-542476-S03610919532013041600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-542476-S11988299792013041600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-542476-S27446858652013041600000) provides an overview of each diagnostic category.

For symptom byte information, refer to Symptom Byte List .

A keyless transmitter button is pressed.

The transmitter that is sending a signal to the remote control door lock receiver is different from those transmitters stored in the body control module.

No action is taken.

1. A current DTC will clear when the fault is no longer present and the ignition switch is cycled.
2. A history DTC will clear after 40 consecutive ignition cycles without a fault present.

1. Perform the «Diagnostic System Check - Vehicle»(ref-542476-S03610919532013041600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-542476-S11988299792013041600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-542476-S27446858652013041600000) provides an overview of each diagnostic category.

DTC Descriptors

For symptom byte information, refer to Symptom Byte List .

A keyless transmitter button is pressed.

Three consecutive low battery signals are received from the same transmitter.

The keyless entry system is inoperative.

The DTC is cleared when a normal transmitter voltage signal is received from the transmitter that set the DTC.

1. Perform the «Diagnostic System Check - Vehicle»(ref-542476-S03610919532013041600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-542476-S11988299792013041600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-542476-S27446858652013041600000) provides an overview of each diagnostic category.

For symptom byte information, refer to Symptom Byte List .

A keyless transmitter button is pressed.

Three consecutive low battery signals are received from the same transmitter.

The keyless entry system is inoperative.

The DTC is cleared when a normal transmitter voltage signal is received from the transmitter that set the DTC.

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the Keyless Entry System. Refer to «Checking Aftermarket Accessories»(ref-542498-S16706522532013041600000) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Keyless Entry System Malfunction»(ref-542497-S42215547832013041600000)
2. «Remote Vehicle Start Malfunction»(ref-542497-S34075884492013041600000)

1. Perform the «Diagnostic System Check - Vehicle»(ref-542476-S03610919532013041600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-542476-S11988299792013041600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-542476-S27446858652013041600000) provides an overview of each diagnostic category.

Diagnostic Aids

1. Unwanted or inadvertent door lock/unlock activation may be requested by the OnStar® Remote Link app. It is possible that a customer may be unaware of account usage, result in an unwanted or phantom door lock/unlock. If normal system diagnosis does results in an inability to verify the customer's concern, contact Technical Assistance Center (TAC).
2. If available, the EL 43241 Keyless Entry Tester may be used to diagnose a low transmitter battery or a malfunctioning transmitter. To test, place the transmitter on the test pad of the EL 43241 and press each transmitter button one at a time, holding each button for three seconds. If the green light on the tester does not illuminate and a tone does not sound, first replace the transmitter battery and retest. If the malfunction continues after replacing the transmitter battery, replace the transmitter.
3. When using the EL 43241 Keyless Entry Tester, first inspect the keyless entry transmitter part number to determine that it is the correct model for the vehicle. An incorrect part number transmitter may pass the test, but it will not activate the keyless entry system.
4. When the vehicle key is in the ignition, the keyless entry functions are disabled from all keyless entry transmitters.

1. Perform the «Diagnostic System Check - Vehicle»(ref-542476-S03610919532013041600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-542476-S11988299792013041600000) for an overview of each diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-542476-S27446858652013041600000) provides an overview of each diagnostic category.

1. Unwanted or inadvertent door lock/unlock activation may be requested by the OnStar® Remote Link app. It is possible that a customer may be unaware of account usage, result in an unwanted or phantom door lock/unlock. If normal system diagnosis does results in an inability to verify the customer's concern, contact Technical Assistance Center (TAC).
2. If the vehicle has a current DTC that illuminates the malfunction indicator lamp (MIL), the cause of the DTC must be diagnosed before proceeding with the Remote Vehicle Start Inoperative diagnostic.
3. The remote vehicle start system will not operate if any of the following conditions are present: A current vehicle DTC that illuminates the malfunction indicator lamp (MIL) The vehicle is in valet mode. More than 2 remote starts have been attempted. The hazard switch is in the ON position. A current hazard switch DTC is set. The vehicle hood is ajar. A current hood ajar DTC is set. Incorrect BCM software is installed and vehicle start is not enabled. The content theft deterrent system detects an alarm trigger. Excessive engine RPM Excessive coolant temperature Accelerator pedal position greater than 0 percent Vehicle not in park Vehicle theft deterrent malfunction A current automatic transmission shift lock control system DTC is set. A vehicle speed sensor signal is detected by the ECM.

Remote Vehicle Start Circuit Description

The BCM receives a signal from the keyless entry transmitter indicating a remote vehicle start request. A message is then sent to the BCM which determines if a crank request message will be sent to the ECM to allow engine starting. To determine if conditions are correct for an remote vehicle start event, the BCM will ensure the following conditions are met

1. A valid hood ajar switch closed signal is present.
2. The doors are locked.
3. The hazard switch is OFF.
4. The vehicle power mode is correct.
5. No content theft deterrent alarm triggers are present.

When the BCM determines all conditions meet those required for an remote vehicle start event, a message is sent via serial data to the ECM. The ECM relies on the remote vehicle start message from BCM to enable remote vehicle start when the crank request signal is received. If the ECM does not receive a valid remote vehicle start message, it will not attempt to start the engine. While the ECM is in remote vehicle start mode it will suspend engine operation if any of the following additional conditions occur

1. Vehicle speed is greater than 0.
2. Transmission is not in PARK.
3. Excessive engine coolant temperature
4. Low oil pressure
5. The malfunction indicator lamp (MIL) is commanded ON.
6. Engine crank time is greater than 30 seconds.
7. Excessive engine speed
8. Accelerator pedal position too high
9. Remote start timer equals 0.
10. Immobilizer system indicates tamper