DIAGNOSTIC STARTING POINT - LIGHTING SYSTEMS
Begin the system diagnosis with the Diagnostic System Check - Lighting Systems . The Diagnostic System Check will provide the following information
- The identification of the control modules which command the system.
- The ability of the control modules to communicate through the serial data circuit.
- 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.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2: Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
- 4: DTCs from all of the modules listed must be retrieved.
- 5: The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications |
| 2 | Turn ON the ignition, with the engine OFF. Attempt to establish communication with the following control module: Climate control panel (CCP) Dash integration module (DIM) Electronic brake control module (EBCM) Instrument panel cluster (IPC) Left headlamp leveling module with TR7 Rear integration module (RIM) Right headlamp leveling module with TR7 Transmission control module (TCM) Does the scan tool communicate with the CCP, EBCM, DIM, IPC, RIM and headlamp modules if equipped? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications |
| 3 | IMPORTANT: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode. Access the Class 2 Power Mode in the Diagnostic Circuit Check on the scan tool. Rotate the ignition switch through all positions while observing the ignition switch power mode parameter. Does the ignition switch parameter reading match the ignition switch position for all switch positions? | Go to Step 4 | Go to Power Mode Mismatch in Body Control System |
| 4 | Select each of the following control modules to display DTCs function on the scan tool. DIM EBCM IPC Lt. Headlamp Leveling Mod. RIM Rt. Headlamp Leveling Mod. TCM Does the scan tool display any DTCs? | Go to Step 5 | Go to Symptoms - Lighting Systems |
| 5 | Does the scan tool display any DTCs which begin with a "U"? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 6 |
| 6 | Does the scan tool display DTC B1000, B1004, B1007, or B1009? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 7 |
| 7 | Does the scan tool display DTC B1327 or B1328? | Go to Diagnostic Trouble Code (DTC) List in Engine Electrical | Go to Diagnostic Trouble Code (DTC) List |
| IMPORTANT |
|---|
| The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode. |
Diagnostic System Check - Lighting Systems
SCAN TOOL OUTPUT CONTROLS
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| LCD Intensity | Special Functions-Miscellaneous Test | The HVAC control module activates its LCD backlighting for 5 seconds when you select ON. |
| LED Intensity | Special Functions-Miscellaneous Test | The HVAC control module activates its control button LED backlighting for 5 seconds when you select ON. |
Climate Control Panel
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Daytime Running Lamps | Special Functions-Output Control | The DIM activates the daytime running lamp input to the turn signal/hazard flasher module for 5 seconds when you select ON. The daytime running lamps should illuminate for 5 seconds. |
| Front Fog Lamps | Special Functions-Output Control | The DIM activates the front FOG LP relay for 5 seconds when you select ON. The front fog lamps and front fog lamp indicator should illuminate for 5 seconds. |
| High Beam - Flash to Pass | Special Functions-Output Control | The DIM activates the HI BEAM relay for 5 seconds when you select ON. The high beam headlamps should illuminate for 5 seconds. |
| High/Low Beam Relay | Special Functions-Output Control | The DIM activates either the LO BEAM relay or the HI BEAM relay for 5 seconds when you select ON, depending on the position of the headlamp dimmer switch. Either the low beam headlamps or the high beam headlamps should illuminate for 5 seconds. |
| Incandescent Dimming | Special Functions-Output Control | The DIM activates the incandescent backlighting lamps when you select ON. The incandescent backlighting lamps should illuminate for 5 seconds. |
| Lighting for Theft | Special Functions-Output Control | The DIM activates the hazard sense input to the turn/hazard/DRL module for 5 seconds when you select ON. The hazard lamps should illuminate for 5 seconds. |
| Parking Lamps Relay | Special Functions-Output Control | The DIM activates the park lamp relay for 5 seconds when you select ON. The park lamps should illuminate for 5 seconds. |
Dash Integration Module
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Switch Dimming Feed | Special Functions-Output Control-Miscellaneous Tests | The Driver Door Module illuminates the door switch incandescent lamps for 5 seconds when you select ON. |
Driver Door Module
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Cluster Dimming | Special Functions-Output Control | Increases and decreases instrument cluster dimming. |
| Display Test | Special Functions-Output Control | The instrument panel cluster activates the Display Test for 5 seconds when you select ON. The indicators should illuminate for 5 seconds. |
Instrument Panel Cluster
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Switch Dimming Feed | Special Functions-Output Control-Miscellaneous Tests | The Left Rear Door Module illuminates the door switch incandescent lamps for 5 seconds when you select ON. |
Left Rear Door Module
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Headlamp Motor Test | Special Functions-Output Control | The left headlamp leveling module moves the left headlamp leveling motor up for 5 seconds when you select UP, then centers the motor. The left headlamp leveling module moves the left headlamp leveling motor down for 5 seconds when you select DOWN, then centers the motor. |
Lt. Headlamp Leveling Mod. (w/ TR7)
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Switch Dimming Feed | Special Functions-Output Control-Miscellaneous Tests | The Passenger Door Module illuminates the door switch incandescent lamps for 5 seconds when you select ON. |
Passenger Door Module
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Courtesy Lamp 1,2 w/dim | Special Functions-Output Control | The RIM activates the courtesy lamps for 5 seconds when you select ON. The courtesy lamps should illuminate for 5 seconds. The courtesy lamps will turn off through the theater dimming feature if you select OFF before the 5 second period has elapsed. |
| Courtesy Lamp 1,2 wo/dim | Special Functions-Output Control | The RIM activates the courtesy lamps for 5 seconds when you select ON. The courtesy lamps should illuminate for 5 seconds. The courtesy lamps will turn off immediately if you select OFF before the 5 second period has elapsed. |
| Inadvertent Power Relay | Special Functions-Output Control | The RIM deactivates the inadvertent power for 5 seconds when you select OFF. The interior lamps should be inoperative for 5 seconds. |
| Rear Fog Lamp Relay | Special Functions-Output Control | The RIM activates the rear fog lamp relay for 5 seconds when you select ON. The rear fog lamps should illuminate for 5 seconds. |
| Reverse Lamp Relay | Special Functions-Output Control | The RIM activates the reverse lamp relay for 5 seconds when you select ON. The backup lamps should illuminate for 5 seconds. |
Rear Integration Module
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Switch Dimming Feed | Special Functions-Output Control-Miscellaneous Tests | The Right Rear Door Module illuminates the door switch incandescent lamps for 5 seconds when you select ON. |
Right Rear Door Module
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Headlamp Motor Test | Special Functions-Output Control | The right headlamp leveling module moves the right headlamp leveling motor up for 5 seconds when you select UP, then centers the motor. The right headlamp leveling module moves the right headlamp leveling motor down for 5 seconds when you select DOWN, then centers the motor. |
Rt. Headlamp Leveling Mod. (w/ TR7)
SCAN TOOL DATA LIST
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| Photocell | Data Display-Lighting Data | Volts/Counts | Varies |
| Photocell Status | Data Display-Lighting Data | Dark/Light | Varies |
| Dimming Enabled | Data Display-Lighting Data | Yes/No | Varies |
| Dim Level Requested | Data Display-Lighting Data | Percent | Varies |
| LCD Intensity | Data Display-Lighting Data | Percent | Varies |
| LED Intensity | Data Display-Lighting Data | Percent | Varies |
Climate Control Panel (CCP)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| Control Power | Output | On/Off | Off |
| Courtesy Lamp Switch | Inputs | On/Off | Off |
| Daytime Running Lamp | Outputs | On/Off | Off |
| Dimming Potentiometer | Inputs | Volts | Varies |
| Front Fog Lamp Relay | Outputs | On/Off | Off |
| Front Fog Lamp Switch | Inputs | Idle/Active | Idle |
| Flash to Pass Switch | Inputs | On/Off | Off |
| Hazard Lamp Switch | Inputs | On/Off | Off |
| Head Lamp Switch | Inputs | On/Off | Off |
| High Beam - Flash to Pa | Outputs | On/Off | Off |
| High Beam Switch/Relay | Inputs | On/Off | Off |
| High/Low Beam Relay | Outputs | On/Off | Off |
| Incandescent Dimming | Outputs | Percent | Varies |
| Lights On With Wipers | Inputs | On/Off | Off |
| Rear Fog Lamp Switch | Inputs | Idle/Active | Idle |
| Park Lamp Relay | Outputs | On/Off | Off |
| Park Lamp Switch | Inputs | On/Off | Off |
| Theft Lighting | Outputs | On/Off | Off |
| Twilight Switch | Inputs | On/Off | Off |
Dash Integration Module (DIM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| Driver Door Jamb Sw. | Inputs | On/Off | Off |
| Switch Dimming | Outputs | Active/Inactive | Active |
Driver Door Module (DDM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| BPP Sensor Calibration | Special Functions | ||
| BPP Sensor A/D Conversi | BAS System Data | Volts | Varies |
| BPP Sensor Displacement | BAS System Data | Percent | Varies |
| BPPS Learned Home Posit | BAS System Data | Volts | Varies |
| BPP Sensor Power Supply | BAS System Data | Volts | Varies |
| Stop Lamp Status | BAS System Data | Valid/Not Valid | Valid |
| Stop Lamp Switch | BAS System Data | Applied/Released | Released |
Electronic Brake Control Module (EBCM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| Park Brake Switch | Inputs | On/Off | Off |
| Left Turn Signal | Inputs | On/Off | Off |
| Right Turn Signal | Inputs | On/Off | Off |
Instrument Panel Cluster (IPC)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| Left Rear Door Jamb Sw. | Inputs | On/Off | Off |
| Switch Dimming | Outputs | Active/Inactive | Inactive |
Left Rear Door Module (LRDM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| Calibrate Module | Special Functions | ||
| Low Beam Input | Data | Volts | 0-25V |
| Front Sensor | Data | Percent | 0-100% |
| Rear Sensor | Data | Percent | 0-100% |
| Stepper Motor Position | Data | Counts | 0-255 |
Lt. Headlamp Leveling Mod.
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| Pass. Door Jamb Sw. | Inputs | On/Off | Off |
| Switch Dimming | Outputs | Active/Inactive | Inactive |
Passenger Door Module (PDM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| TCC Brake Switch | TCC Data | Open/Closed | Closed |
| IMS | Transmission Data | Park/Reverse/ Neutral/Drive5/Drive4/ Drive3/Drive2/ Drive1 | Varies |
Powertrain
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| Inadvertent Power Input | Inputs | Active/Inactive | Inactive |
| Inadvertent Power Relay | Outputs | On/Off | On |
| Overhead Lamps Output | Outputs | On/Off | Off |
| Position Lamp Relay (Ex | Outputs | On/Off | Off |
| Rear Fog Lamp Relay | Outputs | On/Off | Off |
| Reverse Lamp Relay | Outputs | On/Off | Off |
| Trunk Ajar Switch | Inputs | Closed/Ajar | Closed |
Rear Integration Module (RIM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| Rt. Rear Door Jamb Sw. | Inputs | On/Off | Off |
| Switch Dimming | Outputs | Active/Inactive | Active |
Right Rear Door Module (RRDM)
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Ignition ON, with the engine OFF. Transmission shift lever in the PARK position. All lighting turned OFF. All doors closed. | |||
| Calibrate Module | Special Functions | ||
| Low Beam Input | Data | Volts | 0-25V |
| Front Sensor | Data | Percent | 0-100% |
| Rear Sensor | Data | Percent | 0-100% |
| Stepper Motor Position | Data | Counts | 0-255 |
Rt. Headlamp Leveling Mod.
DIAGNOSTIC TROUBLE CODE (DTC) LIST
Diagnostic Trouble Code (DTC) List