Keyless Entry System & Remote Functions: Diagnosis Chevrolet Silverado 3500 HD

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Remote Functions

Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System Check will provide the following information

1. The identification of the control modules which command the system
2. The ability of the control modules to communicate through the serial data circuit
3. The identification of any stored diagnostic trouble codes (DTCs) and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

Conditions for Running the DTC

This DTC runs continuously

Conditions for Setting the DTC

The RCDLR has no calibration loaded.

Action Taken When the DTC Sets

All functions handled by the RCDLR are inoperative

Conditions for Clearing the DTC

A current DTC will clear when software calibrations are installed.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

The keyless entry system must be enabled.

The DTC is set if there are no keyless entry transmitter programmed to the RCDLR.

The keyless entry system is inoperative.

A current DTC is cleared at least one transmitter has been programmed to the RCDLR.

Circuit/System Testing

1. Verify that the transmitter is the correct transmitter for the vehicle. If not correct, replace the transmitter.
2. Place the transmitter on the test pad of the J 43241 and press each button of the transmitter one at a time. See «Special Tools»(ref-317175-S39622829482009060900000) . The tester should sound a tone and illuminate a green light when each button is pressed. If one or more buttons does not sound the tone and illuminate the green light, replace the transmitter battery and retest with the J 43241 . See «Special Tools»(ref-317175-S39622829482009060900000) . If the condition continues after battery replacement, replace the transmitter.
3. Attempt to program the transmitter, refer to «Remote Control Door Lock Transmitter Programming»(ref-317175-S24778961372009060900000) . The transmitter should program. If the transmitter does not program, test the keyless entry antenna for an open/high resistance. If the circuit tests normal, replace the RCDLR.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

A keyless transmitter button is pressed.

The DTC sets after 3 consecutive low battery signals from the same programmed transmitter.

The keyless entry system is inoperative.

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

Diagnostic Aids

The keyless entry transmitter used in the 2-Way Advanced Remote Start System is unique to the system. When servicing or replacing a transmitter, ensure that the correct transmitter is used. The correct transmitter part number can be found in the Accessory section of the parts catalog. Attempting to replace a 2-Way Advanced Remote Start transmitter with a regular service part may result in a failure to program the transmitter.

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the Keyless Entry System. Refer to «Checking Aftermarket Accessories»(ref-317172-S31262273302009060900000) .
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. «Garage Door Opener Inoperative»(ref-317175-S05920979892009060900000)
2. «Keyless Entry System Inoperative»(ref-317175-S17232780802009060900000)
3. «Remote Vehicle Start Inoperative»(ref-317175-S26328072582009060900000)

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the harness connector at the GDO.
2. Ignition OFF, test for less than 5 ohms between the ground circuit terminal 3 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition ON, hold the two outer buttons on the GDO for 30 seconds. After 20 seconds, the LEDs will flash indicating that all learned transmitter values have been cleared. After an additional 10 seconds, the LEDs will flash again indicating it has entered the diagnostic mode. Place the J 41540 adjacent to the GDO and press each button of the GDO one at a time. The tester should indicate when each button is pressed. If the tester indicates that one or more of the buttons does not respond, replace the GDO.
5. Instruct the customer to program the GDO. Refer to the vehicle owners manual. A possible rolling code or incompatibility with the GDO receiver will prevent programming.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

For the J 43241 Keyless Entry Tester, inspect the keyless entry transmitter part number to determine that it is the correct model for the vehicle. See Special Tools . A wrong model transmitter may pass the test, but it will not activate the vehicle remote system.

1. Verify that the transmitter is the correct transmitter for the vehicle. If not the correct transmitter, replace the transmitter.
2. Verify the scan tool FOB Programmed parameter for the appropriate transmitter is Yes. If not the specified value, program the transmitter. Refer to «Remote Control Door Lock Transmitter Programming»(ref-317175-S24778961372009060900000) .
3. Place the transmitter on the test pad of the J 43241 and press each transmitter button one at a time. See «Special Tools»(ref-317175-S39622829482009060900000) . The tester should sound a tone and illuminate a green light with each button press. If one or more buttons does not sound the tone and illuminate the green light, replace the transmitter battery and retest with the J 43241 . See «Special Tools»(ref-317175-S39622829482009060900000) . If the condition continues after battery replacement, replace the transmitter.
4. Operate the transmitter while observing the scan tool Fob Function parameter for the appropriate transmitter. The parameter should correspond with the function selected on the transmitter. If the parameter does not match the function selected on the transmitter, replace the transmitter.
5. Attempt to program the transmitter, refer to «Remote Control Door Lock Transmitter Programming»(ref-317175-S24778961372009060900000) . The transmitter should program. If the transmitter does not program, test the keyless entry coax and/or antenna for a short to ground or an open/high resistance. If the circuit tests normal, replace the RCDLR.
6. If all circuits test normal, replace the RCDLR.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of each diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

The RVS system will not operate if any of the following conditions are present

1. A current vehicle DTC that illuminates the malfunction indicator lamp (MIL)
2. The vehicle is in valet mode.
3. More than 2 remote starts have been attempted.
4. The hazard switch is in the ON position.
5. A current hazard switch DTC is set.
6. The vehicle hood is ajar.
7. A current hood ajar DTC is set.
8. The CTD system detects an alarm trigger.
9. Excessive engine RPM
10. Excessive coolant temperature
11. Accelerator pedal position greater than 0 percent
12. Vehicle not in park
13. Vehicle theft deterrent malfunction
14. A current automatic transmission shift lock control system DRC is set.
15. A vehicle speed sensor signal is detected by the ECM.

RVS Circuit Description

The RCDLR receives a signal from the keyless entry transmitter indicating a RVS 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 RVS event, the BCM will ensure the following conditions are met

1. All vehicle doors are closed.
2. A valid hood ajar switch closed signal is present.
3. The doors are locked.
4. The hazard switch is OFF.
5. The vehicle power mode is correct.
6. No content theft deterrent (CTD) alarm triggers are present.
7. The vehicle is not in valet mode, if equipped.

When the BCM determines all conditions meet those required for an RVS event, a message is sent via serial data to the ECM. The ECM relies on the RVS message from BCM to enable RVS when the crank request signal is received. If the ECM does not receive a valid RVS message, it will not attempt to start the engine. While the ECM is in RVS 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.

The RCDLR receives a signal from the keyless entry transmitter indicating a RVS 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 RVS event, the BCM will ensure the following conditions are met

1. All vehicle doors are closed
2. A valid hood ajar switch closed signal is present
3. The doors are locked
4. The hazard switch is OFF
5. The vehicle power mode is correct
6. No content theft deterrent (CTD) alarm triggers are present
7. The vehicle is not in valet mode (if equipped)

When the BCM determines all conditions meet those required for an RVS event, a message is sent via serial data to the ECM. The ECM relies on the RVS message from BCM to enable RVS when the crank request signal is received. If the ECM does not receive a valid RVS message, it will not attempt to start the engine. While the ECM is in RVS 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