Diagnostic Starting Point - Lighting Systems
Begin the system diagnosis with the Diagnostic System Check - Vehicle in Vehicle DTC Information. The Diagnostic System Check - Vehicle 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 - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.
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 (CCP)
| 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 (DIM)
| 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 (DDM)
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Cluster Dimming | Special Functions-Output Control | Increases and decreases instrument cluster dimming. |
| Display(s) 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 (IPC)
| 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 (LRDM)
| 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. |
Left 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 (PDM)
| 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 w/o 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 (RIM)
| 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 (RRDM)
| 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. |
Right 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 Conversion | 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 |
| Liftgate Lighting Switch | Inputs | Active/Inactive | Inactive |
| 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 |
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.
Scan Tool Data Definitions
See also:
• Diagnostic System Check - Vehicle