Keyless Entry System & Remote Functions: Overview Chevrolet HHR I

Scheme 19

Circuit/System Description

When replacing a remote control door lock receiver (RCDLR), the service replacement part is shipped with no installed software. Before the new RCDLR is operational, a software calibration is required to be downloaded using the SPS terminal. Failure to download this software calibration will result in the setting of DTC B1008.

The remote control door lock receiver (RCDLR) monitors the number of keyless entry transmitters programmed. Until at least one transmitter is programmed, the RCDLR determines a malfunction condition exists.

The keyless entry system is a vehicle entry device. The keyless entry will unlock the vehicle doors or open the rear compartment when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the keyless entry transmitter sending a radio frequency to the remote control door lock receiver (RCDLR). The signal is received by the RCDLR via an internal antenna located within the RCDLR. The RCDLR interprets the signal and activates the requested function via a message over the GMLAN serial data line. A low transmitter battery or radio frequency (RF) interference from aftermarket devices such as 2-way radios, power inverters, cellular phone chargers, computers, etc. may cause a system malfunction. High RF traffic areas, such as gas stations which use pay-at-the-pump RF transponders, may also cause interference that could lead to a malfunction.

Remote vehicle start (RVS) begins as an RF message received by the remote control door lock receiver (RCDLR) from a keyless entry transmitter. The RVS request is sent by the RCDLR to the body control module (BCM) via serial data. The BCM monitors system conditions such as content theft deterrent (CTD), hood ajar status, and body DTCs to determine if an RVS event will occur. If conditions are determined to be acceptable, the RVS message is sent to the engine control module (ECM). The ECM monitors system conditions such as engine control parameters and vehicle theft deterrent (VTD) to determine if engine starting will be allowed. If conditions are acceptable, the ECM will initiate engine starting. During the engine run time in a RVS attempt, before the operator enters the vehicle, the ECM may discontinue engine operation if system conditions require it or a message is received from the BCM requesting the engine be turned OFF.

Keyless Entry System Description

The keyless entry system is a vehicle entry device. The keyless entry system is used in conjunction with the body control module (BCM) to remotely activate certain vehicle features. Keyless entry will lock/unlock the doors when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the transmitter sending a radio frequency to the remote control door lock receiver (RCDLR). The RCDLR interprets the signal and activates the requested function via a serial data message to the body control module (BCM). A low transmitter or vehicle battery or radio frequency (RF) interference from aftermarket devices, such as 2-way radios, power inverters, computers, etc., may cause a system malfunction. High RF traffic areas may also cause interference that could lead to a malfunction. Keyless entry allows you to operate the following components

1. Door locks
2. Liftgate lock
3. Remote rear doors (Panel only)
4. Vehicle locator/panic alarm
5. Illuminated entry lamps
6. Remote vehicle start, if equipped

The keyless entry system has the following components

1. Keyless entry transmitters
2. Keyless entry antenna
3. RCDLR
4. BCM

Unlock All Doors - Second Operation

Momentarily press the transmitter UNLOCK button a second time, within 5 seconds of the first press, to perform the following function

Unlock the remaining doors and the liftgate

Remote Rear Door Operation (Panel)

Press and hold the appropriate rear door button for greater than 1 second to open the respective door.

Keyless Entry System Description and Operation (with SPO Accy 2 Way Remote)

The keyless entry system is a vehicle entry device. The keyless entry system is used in conjunction with the body control module (BCM) to remotely activate certain vehicle features. Keyless entry will lock/unlock the doors, or release the rear compartment lid when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the transmitter sending a radio frequency to the remote control door lock receiver (RCDLR). The RCDLR interprets the signal and activates the requested function via a serial data message to the BCM. A low transmitter or vehicle battery or radio frequency (RF) interference from aftermarket devices, such as 2-way radios, power inverters, computers, etc., may cause a system malfunction. High RF traffic areas may also cause interference that could lead to a malfunction. Keyless entry allows you to operate the following components

1. Door locks
2. Rear compartment lid release
3. Remote vehicle starting, if equipped
4. Illuminated entry lamps
5. Vehicle locator/Panic alarm

The keyless entry system has the following components

1. Keyless entry transmitters
2. Keyless entry antenna
3. BCM
4. RCDLR

Momentarily press the transmitter UNLOCK button a second time, within 5 seconds of the first press, to perform the following function

Unlock the remaining doors.

See also:
• Component Connector End Views
• Headlining Trim Panel Replacement