Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 4: This step verifies that the keyless entry remote transmitter is functional for the test procedures that follow in steps 7 and 8. The remote transmitter must be used in place of the driver door key cylinder when it is the driver door deadbolt motor being tested in step 8.
- 8: This step determines if the deadbolt motor has failed. If it is a passenger door deadbolt being tested in this step, either the driver door key cylinder, or the keyless entry remote transmitter may be used to activate the deadbolt. However, if it is the driver door deadbolt being tested in this step, the driver door key cylinder cannot be used to activate the deadbolt because the lock actuator connector containing the key cylinder input circuit has been disconnected in step 7.Care must be taken when observing the test lamp and attempting to activate the deadbolt motor from either the remote transmitter, or the driver door key cylinder. If you are using the remote transmitter, press the transmitter Lock button twice within 3 seconds; the test lamp should flash once. If you are using the driver door key cylinder, either turn the key to the lock position and hold it there for 3 seconds or longer, or, turn it to the lock position twice within 3 seconds; the test lamp should flash once. Repeating either of these activations, however, will not produce another flash of the test lamp until the door has been commanded to undeadbolt. For either method of activation, remember that the door must be commanded to undeadbolt between each deadbolt command in order for the test to be accurate. Failure to follow these guidelines may result in misdiagnosis and the unnecessary replacement of parts.
- 12: This step determines if it is the door module or a deadbolt motor control circuit that has failed.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Door Lock/Indicator Schematics Connector End View Reference: Power Door Systems Connector End Views DEFINITION: A door lock does not deadbolt, or, none of the door locks will deadbolt. This test is used when only a deadbolt function of the door lock system is inoperative and assumes that all DTCs have been diagnosed. | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Review the Central Door Lock and Deadbolt section of the Power Door Locks Description and Operation in order to verify that the Power Door Locks Inoperative - Deadbolt complaint is present. Refer to Power Door Locks Description and Operation . Does the Central Door Lock and Deadbolt system operate as described in the Description and Operation? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Install a scan tool. With the scan tool, observe the Door Cylinder Switch parameter in the driver door module (DDM) data list. Insert the door key into the driver door lock cylinder, turn it to the Lock position and hold it for 3 seconds. Does the Door Cylinder Switch parameter change from Idle to the appropriate state? | Go to Step 4 | Go to Step 5 |
| 4 | Verify that the door locks can be operated from the keyless entry remote transmitter. Do the door locks operate when using the remote transmitter? | Go to Step 7 | Go to Keyless Entry System Inoperative (Active) or Keyless Entry System Inoperative (Passive) in Keyless Entry |
| 5 | Turn OFF the ignition. Disconnect the harness connector from the driver door lock actuator. Turn ON the ignition, with the engine OFF. Install a 3-amp fused jumper wire between the key cylinder lock switch signal circuit and the key cylinder lock switch ground circuit of the harness connector. With the scan tool, observe the Door Cylinder Switch parameter. Does the Door Cylinder Switch parameter change from Idle to the appropriate state? | Go to Step 13 | Go to Step 6 |
| 6 | Install a 3-amp fused jumper wire between the key cylinder lock switch signal circuit and a good ground. With the scan tool, observe the Door Cylinder Switch parameter. Does the Door Cylinder Switch parameter change from Idle to the appropriate state? | Go to Step 10 | Go to Step 9 |
| 7 | Turn OFF the ignition. Disconnect the harness connector from the door lock actuator associated with the inoperative deadbolt motor. Turn ON the ignition, with the engine OFF. Connect a test lamp between the deadbolt motor control circuit of the harness connector and a good ground. Does the test lamp illuminate? | Go to Step 11 | Go to Step 8 |
| 8 | Make sure the door associated with the inoperative deadbolt motor locks and unlocks properly. Make sure the test lamp is still connected between the deadbolt motor control circuit of the harness connector and a good ground. If the door being tested is the driver door, attempt to deadbolt the door by pressing the Lock button on the keyless entry remote transmitter twice within 3 seconds. If the door being tested is one of the passenger doors, attempt to deadbolt the door by using either the remote transmitter, or the driver door key cylinder. Did the test lamp flash once? | Go to Step 14 | Go to Step 12 |
| 9 | Test the door key switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 15 |
| 10 | Test the door key switch ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 15 |
| 11 | Test the driver door lock actuator deadbolt control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 16 |
| 12 | Test the driver door lock actuator deadbolt control circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 16 |
| 13 | Inspect for poor connections at the harness connector of the driver door lock actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 17 |
| 14 | Inspect for poor connections at the harness connector of the appropriate door lock actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 18 |
| 15 | Inspect for poor connections at the harness connector of the DDM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 19 |
| 16 | Inspect for poor connections at the harness connector of the appropriate door control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 20 | Go to Step 19 |
| 17 | Replace the driver door lock actuator. Refer to Lock Assembly, Inside Handle Cable Assembly Replacement - Front Door (w/o UA2) or Lock Assembly, Inside Handle Cable Assembly Replacement - Front Door (UA2) . Did you complete the replacement? | Go to Step 20 | |
| 18 | Replace the appropriate door lock actuator. Refer to Lock Assembly, Inside Handle Cable Assembly Replacement - Front Door (w/o UA2) or Lock Assembly, Inside Handle Cable Assembly Replacement - Front Door (UA2) . Did you complete the replacement? | Go to Step 20 | |
| 19 | Replace the door control module. Refer to Control Module References in Computer/Integration Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 20 | |
| 20 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Power Door Locks Inoperative - Deadbolt
Power Windows Operation
Each door is equipped with a power window motor that contains its own module. Each power window motor receives a hot at all times battery supply voltage and constant ground source. When a window switch on the DDSA is activated to the up or down position, the DDSA will interpret the signal and send a GMLAN message to the appropriate door module. Upon receipt of the message, the door module will send a voltage signal to the window motor module on the appropriate window motor signal circuit. The window motor module will then supply battery voltage and ground to the window motor to drive the window motor up or down.
When a power window is activated from a passenger door switch, the operation is the same as described above except, the window motor signal circuits are connected directly to the associated door module
Window Express Up and Down Operation
The express feature allows the windows to be fully opened or closed by momentarily pressing the window switch to the second detent of the up or down position. Due to safety concerns with express up functionality, the system is designed to detect objects that become trapped between the window glass and window frame and reverse the direction of the window. This includes the use of window motor position sensors in the motor that determine the window position. Before the express functionality may be used, the window motor must be initialized. This requires operating the power window to the full up and full down positions so the window motor module can learn the positions of the up stop, down stop and the distance in between. The window module will then report this status to the door module through the power window status circuit. For further information on window initialization, refer to Window Motor Programming - Express Function .
When the window switch is activated to an express up or down position, the door module will first receive the up or down signal and then the express signal is received. The door module will then apply voltage to the power window up or down signal circuit and then apply voltage to the apposing power window motor signal circuit. This will tell the window motor module that an express function has been requested. The window motor module will then supply battery voltage and ground to the motor to drive the window to the full up or down position.
Power Door Latch Unlatch Operation
When either exterior door handle is lifted, switched ground signals are sent to the DDM or PDM and the RCDLR through the LF or RF door handle switch signal circuits. Upon receipt of these inputs, the DDM or PDM and the RCDLR will check the door lock status of the system as described above. Once the enable criteria has been met, the DDM or PDM will supply power and ground to door latch control circuits and the door will release.
Power Door Lock Operation (Front Doors)
The front doors do not have traditional door lock actuators. They have electronically controlled door latches that will operate depending on the status of the door lock system. This status is determined by the front door modules and the last known state of the lock system. If the last known state is LOCK, the latches will not release when the door handles are operated. If the last known state is UNLOCK, the latches will release when the door handles are operated. The front doors are also equipped with red door lock status indicators. The front door modules will supply power and ground to the indicators to illuminate them when the lock system is in a virtual state of lock. The indicators will not continuously illuminate when the vehicle is locked. They will illuminate for approximately 5 seconds after a lock switch activation or after a door handle has been operated and the front door modules are in a virtual state of lock. For further information on the front door latches, refer to Power Door Latch Description and Operation .
Power Door Lock Operation (Rear Doors)
Each rear door lock actuator is powered and controlled by the RRDM and LRDM mounted in the individual door. The RCDLR, which is the master control for the door lock system, determines when the lock and unlock functions are permitted. The RCDLR receives and examines lock and unlock function requests from the individual door modules via GMLAN serial data, or from RFA transmissions. The RCDLR also examines the transmission shift selector position and power mode information available over the GMLAN serial data circuits. If the RCDLR determines that all conditions are correct for a lock or unlock function, a message is sent via GMLAN serial data back to the individual door modules commanding them to perform the lock or unlock function requested.
Outside Rearview Mirror Operation
The mirror select switch is used to select the mirror to be adjusted. The mirror direction switch is used to control the mirror in a specific direction. These are both direct inputs to the DDSA. The DDSA reports the activation of these switches to the DDM and PDM via the GMLAN serial data circuit.
The DDM and PDM upon receipt of the GMLAN message, will provide battery voltage and ground to the appropriate mirror motor control circuits to move the mirror glass. The DDM and PDM will reverse the polarity of the voltage and ground it applies to the mirror motor control circuits in order to run the motor in opposite directions.
Memory Mirror Operation
Mirror position is determined by both horizontal and vertical position sensors in each of the power mirrors. The DDM and PDM supplies a reference voltage and a low reference to these sensors and determines mirror position through the horizontal and vertical position signal circuits. The position sensors, which are potentiometer type sensors, are attached to the corresponding position motor of each mirror, and provide constant information, in the form of feedback voltage to the associated door module to indicate the vertical and horizontal position of the mirror. When mirror positions are programmed into the personalization package, the front door modules store the positions indicated by the feedback voltages of the position sensors. When a memory recall is requested, the door modules compare the feedback voltages indicated by the current mirror positions to the stored feedback voltages. The door modules then move the mirrors until the current feedback voltages match the stored feedback voltage levels.
Mirror Tilt in Reverse Operation
The DDM and PDM communicate with the Instrument Panel Cluster (IPC) over the GMLAN serial data circuit. When the gear selector is shifted to reverse, the PCM transmits this status via a GMLAN message to the IPC. The IPC then transmits the reverse status message to the DDM and PDM, which apply voltage and ground to the vertical motors of the outside rearview mirrors to tilt the mirror faces down 7 degrees. This allows the driver to see the curb while parallel parking. When the gear selector is shifted out of reverse, the DDM and PDM will control the vertical mirror motors to return the mirror faces to their previous positions.
Heated Mirror Operation
The mirrors heat during the defrost/defog cycles for the rear window. The heated mirrors are connected to the DDM and PDM. The DDM and the PDM receive a GMLAN serial data message from the HVAC control module indicating that the rear defrost switch has been activated. If conditions are correct, the DDM and PDM will apply battery voltage to the rearview mirror heating element supply circuits, and ground to the return circuits. Under certain voltage conditions the Instrument Panel Module (IPM) could send a message to the DDM and PDM to conserve voltage and the heated mirror mirrors may be cycled ON and OFF until operating conditions improve.
Power Folding Mirror Operation
The operator may simultaneously retract both mirrors to a fully folded position, in which they are closely tucked in and parallel to the front door windows, or simultaneously extend both mirrors to the fully unfolded position for normal driving.
For this feature, the DDSA has an additional power folding mirror switch built into it and each mirror contains an additional power folding mirror motor. When the switch is activated to fold mirrors, the switch contacts close, the DDSA interprets the signal input, and sends the command on to the DDM and PDM. The DDM and PDM each apply battery voltage and ground to the appropriate circuits of their respective power folding motor in order to retract the mirrors. When the switch is activated to unfold the mirrors, the door modules reverse the polarity of the voltage and ground applied to the reversible folding motors to move both mirrors to the fully extended position.
The power folding mirror switch is a one position momentarily switch. Each press will activate the mirrors in the opposite direction.