Lighting Systems Buick LeSabre VIII

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

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Begin the system diagnosis with the DIAGNOSTIC SYSTEM CHECK - LIGHTING SYSTEMS . 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.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. 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.
2. 4 DTCs from all of the modules listed must be retrieved.
3. 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.

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SCAN TOOL DATA DEFINITIONS

1. Ambient Light Sensor The scan tool displays 0-5 volts. The ambient light sensor input signal, 0.09-4.75 volts is the normal operating range.
2. Battery Voltage The scan tool displays 0-20 Volts. The voltage as received on the battery positive voltage circuit of the module.
3. Control Power The scan tool displays On/Off. The state of control power.
4. Daytime Running Lamp The scan tool displays On/Off. The commanded state of the daytime running lamp relay.
5. Drivers Door Jamb Sw. The scan tool displays On/Off. The state of the drivers door jamb switch. On indicates the door is open and Off indicates the door is closed.
6. Flash to Pass Switch The scan tool displays On/Off. The state of the flash to pass switch.
7. Head Lamp Switch The scan tool displays On/Off. The state of the flash to pass switch signal. On indicates the flash to pass headlamps are requested on.
8. High Beam - Flash to Pa The scan tool displays On/Off. The commanded state of the high beam relay.
9. High Beam Lamp The scan tool displays On/Off. The state of the headlamp high beam switch.
10. High beam Switch The scan tool displays On/Off. The state of the headlamp high beam switch.
11. Inadvertent Power Input The scan tool displays Active/Inactive. The state of the inadvertent power.
12. Inadvertent Power Relay The scan tool displays On/Off. The commanded state of the inadvertent power relay.
13. Interior Dim Pot The scan tool displays 0-5 volts. The IP dimmer switch input signal, 0.09-4.75 volts is the normal operating range.
14. Interior Lamp Switch The scan tool displays On/Door. The state of the interior lamp switch.
15. Incandescent Dim 1 The scan tool displays On/Off. The state of the incandescent lamp ground circuit.
16. Left Rear Door Jamb Sw. The scan tool displays On/Off. The state of the left rear door jamb switch. On indicates the door is open and Off indicates the door is closed.
17. Lights On with Wipers The scan tool displays On/Off. The state of the wiper/washer system.
18. Low Beam Output The scan tool displays On/Off. The commanded state of the low beam relay.
19. Lt. Turning Signal Sw. The scan tool displays On/Off. The state of the left turn signal switch.
20. Overhead Lamps Output The scan tool displays On/Off. The commanded state of the overhead lamps.
21. Park Lamp The scan tool displays On/Off. The state of the park lamp switch.
22. Park Lamp Relay Output The scan tool displays On/Off. The commanded state of the park lamp relay.
23. Pass. Door Jamb Sw. The scan tool displays On/Off. The state of the right front door jamb switch. On indicates the door is open and Off indicates the door is closed.
24. Reverse Lamp Relay The scan tool displays On/Off. The commanded state of the reverse lamp relay.
25. Rt. Rear Door Jamb Sw. The scan tool displays On/Off. The state of the right rear door jamb switch. On indicates the door is open and Off indicates the door is closed.
26. Rt. Turning Signal Sw. The scan tool displays On/Off. The state of the right turn signal switch.
27. Twilight Delay Pot The scan tool displays 0-5 volts. The twilight delay switch input signal, 0.09-4.75 volts is the normal operating range.

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Circuit Description

The IP dimmer switch is a potentiometer. The Instrument Panel Module (IPM) determines the control setting based on the voltage from the IP dimmer switch. The IPM sends out a class 2 message to the Dash Integration Module (DIM). The intensity of the of the interior back lighting shall be adjustable when ever the park lamps are on. The intensity of the vacuum florescent displays shall only be adjustable when it is night and the park lamps are active.

Conditions For Running DTC

The IPM is powered.

Conditions For Setting DTC

The interior lamp rheostat voltage is less than 0.09 V or greater than 4.75 V.

Action Taken When DTC Sets

Set dimming level to 100 percent (full brightness for all displays).

Conditions For Clearing DTC

The IPM does not detect a voltage that is less than or greater than the predetermined value during the diagnostic self test.

The numbers below refer to the step numbers on the diagnostic table.

1. 3 Tests for the proper operation of the circuit in the high voltage range.
2. 4 Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
3. 5 Tests for a short to ground in the 5 volt reference circuit.

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The IP dimmer switch is a potentiometer. It is powered by the HVAC control module. The HVAC control module determines the level of dimming desired based on the voltage from the IP dimmer switch. The HVAC control module converts the IP dimmer switch feedback voltage to a digital signal and puts it on the Class II communication bus.

The HVAC control module must be powered.

The feedback voltage is less than 0.2 V for more than 200 milliseconds.

The dimming level is set to full brightness for all displays.

Conditions For Clearing MIL/DTC

The IP dimmer switch short to ground condition must be corrected.

The numbers below refer to the step numbers on the diagnostic table.

1. 3 Tests for the proper operation of the circuit in the high voltage range.
2. 4 Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
3. 5 Tests for a short to ground in the 5 volt reference circuit.
4. 11 Tests for a short to ground in the twilight sentinel delay signal circuit of the twilight delay switch. A short to ground may set DTC B2627 and DTC B2642 depending position of the IP dimmer switch.

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The IP dimmer switch is a potentiometer. It is powered by the HVAC control module. The HVAC control module determines the level of dimming desired based on the voltage from the IP dimmer switch. The HVAC control module converts the IP dimmer switch feed back voltage to a digital signal and puts it on the Class II communication bus.

The HVAC control module must be powered.

The feedback voltage is greater than 4.8 V for more than 200 milliseconds.

The dimming level is set to full brightness for all displays.

The IP dimmer switch short to voltage condition must be corrected.

The numbers below refer to the step numbers on the diagnostic table.

1. 3 Tests for the proper operation of the circuit in the high voltage range.
2. 4 Tests for the proper operation of the circuit in the low voltage range, If the fuse in the jumper opens when you perform this test, the instrument panel lamps dimmer switch signal circuit is shorted to voltage.
3. 5 Tests for a short to ground in the 5 volt reference circuit.

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The twilight delay switch is a potentiometer. The Instrument Panel Module (IPM) determines the control setting based on the voltage from the twilight delay switch. The IPM module sends out a class 2 message to the Dash Integration Module (DIM).

Conditions for Running the DTC

The IPM is powered.

Conditions for Setting the DTC

The twilight delay switch voltage is less than 0.09 V or greater than 4.75 V.

Action Taken When the DTC Sets

The IPM sets twilight status to ON.

Conditions for Clearing the MIL/DTC

The IPM does not detect a voltage that is less than or greater than the predetermined value during the diagnostic self test.

The numbers below refer to the step numbers on the diagnostic table.

1. 3 Tests for the proper operation of the circuit in the high voltage range.
2. 4 Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
3. 5 Tests for a short to ground in the 5 volt reference circuit.

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The twilight delay switch is a potentiometer. The HVAC control module determines the control setting based on the voltage from the twilight delay switch. The HVAC control module controls the headlamps automatic on/off and delayed off functions.

1. Enable flag is set to enable.
2. The HVAC control module is powered.

1. The twilight delay switch voltage is less than 0.2 V.
2. The above condition is present for greater than 2 seconds.

Twilight status set to ON.

The HVAC control module does not detect a voltage below the predetermined value during the diagnostic self test.

The numbers below refer to the step numbers on the diagnostic table.

1. 3 Tests for the proper operation of the circuit in the high voltage range.
2. 4 Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
3. 5 Tests for a short to ground in the 5 volt reference circuit.

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The twilight delay switch is a potentiometer. The HVAC control module determines the control setting based on the voltage from the twilight delay switch. The HVAC control module controls the headlamps automatic on/off and delayed off functions.

1. Enable flag is set to enable.
2. The HVAC control module is powered.

1. The twilight delay switch voltage is greater than 4.8 V.
2. The above condition is present for greater than 2 seconds.

Twilight status set to ON.

The HVAC control module does not detect a voltage above the predetermined value during the diagnostic self test.

The numbers below refer to the step numbers on the diagnostic table.

1. 3 Tests for the proper operation of the circuit in the high voltage range.
2. 4 Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the twilight sentinel delay signal circuit is shorted to voltage.
3. 5 Tests for a short to ground in the 5 volt reference circuit.

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The sunload sensor assembly is a light sensitive photocell. The HVAC control module determines the ambient light based on the voltage from the sunload sensor assembly. The HVAC control module controls the head lamp automatic on/off and delayed off functions.

The IPM is powered.

The sunload sensor assembly voltage is less than 0.09 or greater than 4.75 V.

Sets the variable ambient light status to DARK.

The IPM sets a DTC.

The IPM does not detect a voltage that is less than or greater than the predetermined value during the diagnostic self test.

The numbers below refer to the step numbers on the diagnostic table.

1. 3 Tests for the proper operation of the circuit in the high voltage range.
2. 4 Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.

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The sunload sensor assembly is a light sensitive photocell. The HVAC control module determines the ambient light based on the voltage from the sunload sensor assembly. The HVAC control module controls the head lamp automatic on/off and delayed off functions.

1. Enable flag is set to enable.
2. DTC B1327 is not current.
3. The HVAC control module is powered.

1. The ambient light voltage is less than 0.2 V.
2. The above condition is present for greater than 2 seconds.

1. The HVAC control module sets the variable ambient light status to status set to DARK.
2. The HVAC control module sets a DTC.

The HVAC control module does not detect a voltage less than the predetermined value during the diagnostic self test.

The numbers below refer to the step numbers on the diagnostic table.

1. 3 Tests for the proper operation of the circuit in the high voltage range.
2. 4 Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the twilight sentinel delay signal circuit is shorted to voltage.

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The sunload sensor assembly is a light sensitive photocell. The HVAC control module determines the ambient light based on the voltage from the sunload sensor assembly. The HVAC control module controls the head lamp automatic on/off and delayed off functions.

1. Enable flag is set to enable.
2. DTC B1327 is not current.
3. The HVAC control module is powered.

1. The sunload sensor assembly voltage is greater than 4.8 V.
2. The above condition is present for greater than 2 seconds.

1. HVAC control module sets the variable ambient light status to status set to DARK.
2. The HVAC control module sets a DTC.

The HVAC control module does not detect a voltage greater than the predetermined value during the diagnostic self test.

The numbers below refer to the step numbers on the diagnostic table.

1. 3 Tests for the proper operation of the circuit in the high voltage range.
2. 4 Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the sunload sensor assembly signal circuit is shorted to voltage.

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Note. The following steps must be completed before using the symptom table.

1. Perform the «DIAGNOSTIC SYSTEM CHECK - LIGHTING SYSTEMS»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control module(s) can communicate via the serial data link.
2. Review the system description and operation in order to familiarize yourself with the system functions. Refer to «INTERIOR LIGHTING SYSTEMS DESCRIPTION & OPERATION»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems) and «EXTERIOR LIGHTING SYSTEMS DESCRIPTION & OPERATION»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the lighting system. Refer to «CHECKING AFTERMARKET ACCESSORIES»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT & POOR CONNECTIONS .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «BACKUP LAMPS ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
2. «BACKUP LAMPS INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
3. «CORNERING LAMPS ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
4. «CORNERING LAMPS INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
5. «COURTESY LAMPS ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
6. «COURTESY LAMPS INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
7. «DAYTIME RUNNING LAMPS (DRL) ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
8. «DAYTIME RUNNING LAMPS (DRL) INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
9. «HAZARD LAMPS ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
10. «HAZARD LAMPS INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
11. «HEADLAMP SWITCH ON INDICATOR ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
12. «HEADLAMP SWITCH ON INDICATOR INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
13. «HEADLAMPS ALWAYS ON - LOW OR HIGH BEAM»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
14. «HEADLAMPS INOPERATIVE - LOW BEAMS»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
15. «HEADLAMPS INOPERATIVE - HIGH BEAMS»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
16. «HEADLAMPS INOPERATIVE - FLASH TO PASS»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
17. «HIGH BEAM INDICATOR ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
18. «HIGH BEAM INDICATOR INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
19. «INTERIOR BACK LIGHTING DOES NOT DIM»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
20. «INTERIOR BACK LIGHTING INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
21. «IP COMPARTMENT LAMP INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
22. «IP COMPARTMENT LAMP ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
23. «LICENSE LAMPS INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
24. «PARK LAMPS ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
25. «PARK LAMPS INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
26. «READING LAMP(S) ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
27. «READING LAMP(S) INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
28. «REAR COMPARTMENT LAMP(S) ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
29. «REAR COMPARTMENT LAMP(S) INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
30. «STOP LAMPS ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
31. «STOP LAMPS INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
32. «TURN SIGNAL LAMPS &/OR INDICATORS ALWAYS ON OR FLASHING»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
33. «TURN SIGNAL LAMPS &/OR INDICATORS INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
34. «TWILIGHT SENTINEL DELAY INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
35. «UNDERHOOD LAMP ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
36. «UNDERHOOD LAMP INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
37. «VANITY MIRROR LAMP(S) ALWAYS ON»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)
38. «VANITY MIRROR LAMP(S) INOPERATIVE»(/buick/lesabre/viii-2000-2005/remont/exterior-lights/#lighting-systems)

CHECKING AFTERMARKET ACCESSORIES

Do not connect aftermarket accessories into the following circuits

1. SIR circuits, all such circuits are indicated on circuit diagrams with the SIR symbol.
2. OBD II circuits, all such circuits are indicated on circuit diagrams with the OBD II symbol.

Always check for aftermarket accessories (non-OEM) as the first step in diagnosing electrical problems. If the vehicle is so equipped, disconnect the system to verify that these add-on accessories are not the cause of the problems.

Possible causes of vehicle problems related to aftermarket accessories include

1. Power feeds connected to points other than the battery.
2. Antenna location.
3. Transceiver wiring located too close to vehicle electronic modules or wiring.
4. Poor shielding or poor connectors on antenna feed line.
5. Check for recent service bulletins detailing installation guidelines for aftermarket accessories.

The number below refers to the step number on the diagnostic table.

1. 3 Listen for an audible click when the reverse lamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.

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The numbers below refer to the step numbers on the diagnostic table.

1. 3 Listen for an audible click when the reverse lamp relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
2. 4 Tests for voltage at the control side of the reverse lamp relay.
3. 5 Verifies that the control module is providing ground to the reverse lamp relay.

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The number(s) below refer to the step number(s) on the diagnostic table.

1. 4 Listen for an audible click when the relay operates. Cycle between low and high positions. Repeat the cycles as necessary.
2. 5 Tests for supply voltage at the control side of the relay.
3. 6 Verifies that the headlamp switch is providing ground to the relay.

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Removal Procedure

1. Remove the left IP trim plate. Refer to «TRIM PLATE REPLACEMENT - IP ACCESSORY LEFT»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) in Instrument Panel, Gages and Console.
2. Disconnect the electrical connectors (2, 3).
3. Remove the headlamp switch from the left IP trim plate. Remove the fastener (1). Tilt the headlamp switch (2) to remove.

Installation Procedure

1. Install the headlamp switch (2) to the IP trim plate. (Scheme 167) CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
2. Install the fastener (1). Tighten the fastener to 2 N.m (18 in lbs).
3. Connect the electrical connectors (2, 3). (Scheme 166)
4. Install the IP trim plate. Refer to «TRIM PLATE REPLACEMENT - IP ACCESSORY LEFT»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) in Instrument Panel, Gages and Console.

1. Remove the left IP closeout/insulator panel. Refer to «CLOSEOUT/INSULATOR PANEL REPLACEMENT - LEFT»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) in Instrument Panel, Gages and Console.
2. Remove the turn signal/hazard warning flasher (2) from the IP carrier.
3. Disconnect the electrical connector (1) from the turn signal/hazard warning flasher (2).

Scheme 166

1. Connect the electrical connector (1) the turn signal/hazard warning flasher (2).
2. Install the turn signal/hazard warning flasher (2) to the IP carrier.
3. Install the left IP closeout/insulator panel. Refer to «CLOSEOUT/INSULATOR PANEL REPLACEMENT - LEFT»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) in Instrument Panel, Gages and Console.

1. Remove the ashtray assembly from the vehicle. Refer to «ASHTRAY REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) in Instrument Panel, Gages and Console.
2. Remove the bulb housing (1) from the ashtray frame.
3. Remove the bulb from the bulb housing (1).

Scheme 167

1. Install the bulb into the bulb housing (1).
2. Install the bulb housing (1) into the ashtray frame.
3. Install the ashtray assembly into the vehicle. Refer to «ASHTRAY REPLACEMENT»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) in Instrument Panel, Gages and Console.

1. Using a thin bladed tool, carefully pry the lamp lens from the overhead console.
2. Using a thin bladed tool, carefully pry the metal shield inward until the retaining tabs clear the notches.
3. Remove the metal shield.
4. Remove the courtesy lamp bulb.

1. Install the bulb into the overhead console.
2. Insert one side of the metal shield into the overhead console.
3. Gently squeeze the shield together just enough so the retainer tabs fit into the notches in the lamp cavity.
4. Snap the lamp lens into the overhead console.

1. Remove the Instrument Panel (IP) storage compartment. Refer to «STORAGE COMPARTMENT REPLACEMENT - IP»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) in Instrument Panel, Gages, and Console.
2. Disconnect the electrical connector.
3. Squeeze the tabs on the switch and lamp assembly in order to release the switch from the IP storage compartment.
4. Remove the switch.

1. Snap the switch and lamp assembly into the IP storage compartment.
2. Connect the electrical connector. (Scheme 172)
3. Install the instrument panel storage compartment. Refer to «STORAGE COMPARTMENT REPLACEMENT - IP»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) in Instrument Panel, Gages, and Console.

1. Remove the IP compartment storage bin. Refer to «STORAGE COMPARTMENT REPLACEMENT - IP»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) in Instrument Panel, Gages, and Console.
2. Disconnect the electrical connectors.
3. Depress the IP compartment lamp and switch assembly locking tabs in order to remove the lamp assembly from the IP storage compartment.
4. Remove the bulb from the lamp housing.

1. Install the bulb into the lamp housing.
2. Snap the lamp housing and switch assembly into the IP storage compartment.
3. Connect the electrical connector. (Scheme 174)
4. Install the IP storage compartment. Refer to «STORAGE COMPARTMENT REPLACEMENT - IP»(/buick/lesabre/viii-2000-2005/remont/gauges-instrument-panels/#instrument-panel-gauges-console) in Instrument Panel, Gages, and Console.

1. Using a thin-bladed tool, insert the edge of the tool under the lamp lens.
2. Carefully snap the lamp lens out of the pull handle assembly.
3. Carefully remove the metal shield.
4. Remove the bulb.

1. Install the bulb into the pull handle assembly.
2. Install the metal shield.
3. Install the lens Into the pull handle assembly.

1. Open the vanity mirror cover.
2. Using a thin-bladed tool, insert the edge of the tool under the outside edge of the vanity mirror lamp lens, (4).
3. Carefully snap the vanity mirror lamp lens (4) out of the retaining slots.
4. Remove the vanity mirror lamp bulb (3).

Scheme 168

1. Install the vanity mirror lamp bulb (3).
2. Install the vanity mirror lamp lens (4) into the vanity mirror assembly.
3. Close the vanity mirror cover.

1. Remove the headlamp fasteners.
2. Using a pry bar, gently pry in the center area of the headlamp assembly. Pry the headlamp assembly straight forward in order to unsnap the headlamp ball stud from the ball stud socket.
3. Slide the headlamp straight forward and disconnect the headlamp electrical connectors from the forward lamp wiring harness.
4. Remove the headlamp from the vehicle.

1. Install the headlamp to the vehicle.
2. Connect the electrical connectors.
3. Position the headlamp in order to align the locator pins with the headlamp mounting bracket.
4. Press the headlamp rearward in order to engage the ball stud with the ball stud socket. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
5. Install the headlamp fasteners. Tighten the headlamp mounting fasteners to 9 N.m (80 in lbs). see scheme 180

HEADLAMP AIMING

The screen method is preferred for aiming headlamps. If the headlamp is equipped with aiming pads, headlamp aiming may be performed using the alternate procedure.

Headlamp aiming is done with the vehicle's low beam lamps. The high beam lamps will be correctly aimed if the low beam lamps are aimed properly. If the high beam needs adjustment, follow the screen method using the high beam bulb as the reference for measurements.

Screen Method for Headlamp Aiming (Visual Aim)

Note. Some state and local laws specify requirements for headlamp aim. All of these laws must be complied with when performing any headlamp aiming operations.

Headlamp aim should be checked

Scheme 169

1. When a new headlamp capsule is installed.
2. If service or repairs to the front end area have (or may have) disturbed the headlamps or their mounting.
3. The area will consist of a level surface large enough to allow for a vehicle and an additional 7.62 m (25 feet) measured from face of lamps to the front of the aiming screen.
4. The screen will be 1.52 m (5 ft) high x 3.66 m (12 ft) wide with a matte white surface well shaded from extraneous light, and properly adjusted to the floor on which the vehicle stands. Provisions may be made for moving the screen so it can be aligned parallel with the vehicle.
5. The screen shall be provided with a fixed vertical centerline, two laterally adjustable vertical tapes, and one vertically adjustable horizontal tape.
6. If a regular commercial aiming screen is not available, the screen may consist of a vertical wall having a clear uninterrupted area approximately 1.83 m (6 ft) high and 3.66 m (12 ft) wide. The surface should be finished with a washable non-gloss white paint.
7. After the aiming screen has been set up in its permanent location, it is necessary to paint a reference line on the floor directly under the lens of the lamps to indicate the proper location of the headlamps when they are being aimed: Distance between headlamps (1). Center line of screen (2). Adjustable vertical pointer (3). Adjustable horizontal tape (4). Diagram of light screen (5). Vertical center line ahead of right headlamp pointer position (6). 7.62 m (25 ft) (7). Car axis (8). Adjustable vertical pointer. Horizontal center line of lamps. Vertical center line ahead of left headlamp.

Prior to aiming the headlamps, the following steps must be taken

1. Remove any snow, ice or mud from the vehicle.
2. The vehicle must have a full tank of gas.
3. Stop all other work on the vehicle.
4. If any service has been performed on the vehicle, make sure that all of the components are back in their original place.
5. The vehicle must be on a level surface.
6. The vehicle left tires must be aligned with the reference line extending from the screen with the headlamps aligned with the reference line.
7. Do not load any cargo in the vehicle.
8. The vehicle must contain one person or 72.56 kg (160 lb) on the driver's seat.
9. Inflate the tires to the proper pressure.
10. Simulate the vehicle loads if the intended use of the vehicle is for hauling heavy loads or towing a trailer.
11. Rock the vehicle in order to stabilize the suspension.
12. Turn on the headlamps to low beam and observe the left and the top edges of the high intensity zone on the screen. The edges of the high intensity zone should fall within the specifications.

Headlamp Aiming Procedure

1. Open the hood.
2. Measure from the floor to the center of the headlamp bulb. (Some headlamps have an aim dot marked on the headlamp lens).
3. At the screen, measure from the floor and place the horizontal tape at the measured distance.
4. Measure from the reference line on the floor to the left headlamp bulb centerline.
5. At the screen, measure from the reference line and place the vertical tape at the measured distance.
6. Measure from the reference line on the floor to the right headlamp bulb centerline.
7. At the screen, measure from the reference line and place the vertical tape at the measured distance. NOTE: Do not cover the headlamp, this may cause excessive heat build up.
8. Turn on the low beam headlamps and block the light from projecting onto the screen from the passenger side headlamp.
9. Adjust the vertical aim of the headlamps to the specifications required by the state and the local authorities, or as shown in step number 8.
10. Rotate the headlamp adjuster (1) to change the vertical aim of the headlamp.
11. Repeat the aiming procedure for the passenger side headlamp while blocking the light from projecting onto the screen from the driver side headlamp.
12. Close the hood.
13. This illustration represents the Visual Optics Left (VOL) pattern.
14. This illustration represents the Visual Optics Right (VOR) pattern.
15. This illustration represents all headlamps, except the VOL and VOR.
16. This illustration represents the high beam pattern for all headlamps, including VOL and VOR.

Alternate Aiming Procedure

Note. Tool Required: Composite Headlight Aimer Adapter (J 25300-203).

Instructions for use accompany the tool.

This procedure may only be used on headlamps equipped with aiming pads. Adjustment settings are embossed on the headlamp lens. They are typically located near the aiming pads. In some cases, the adjustment settings are located in other areas of the lens. They will be represented by a number followed by the letter V or the letter H.

1. Remove any snow, ice or mud from the vehicle.
2. The vehicle should be fully assembled and all other work stopped while the headlamp aiming is being done.
3. The vehicle should contain cargo or be loaded to represent normal vehicle use.
4. Tires should be properly inflated.
5. Rock the vehicle to stabilize the suspension.
6. Using J 25300-203, adjust the headlamps to the specifications required by state and local authorities.

1. Remove the rear shelf trim panel (3). Refer to «TRIM PANEL REPLACEMENT - REAR WINDOW SHELF»(/buick/lesabre/viii-2000-2005/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.
2. Remove the high mounted stop lamp wiring (4) from the rear shelf panel (3).
3. Remove the fasteners (1) retaining the high mounted stop lamp (2) to the rear shelf trim panel.
4. Remove the high mount stop lamp (2) from the rear shelf trim panel (3).

Scheme 170

1. Install the high mount stop lamp (2) to the rear shelf trim panel (3).
2. Install the high mounted stop lamp wiring (4) to the rear shelf panel (3). CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
3. Install the fasteners that secure the high mount stop lamp (2) to the rear shelf trim panel (3). Tighten the fasteners to 2 N.m (18 in lbs).
4. Install the rear shelf trim panel (3). Refer to «TRIM PANEL REPLACEMENT - REAR WINDOW SHELF»(/buick/lesabre/viii-2000-2005/remont/exteriorinterior-trim/#interior-trim) in Interior Trim.

1. Disconnect the tail/backup lamp harness connector from the from the body wiring harness.
2. Remove the fasteners securing the tail/backup lamp assembly to the rear compartment lid.
3. While supporting the tail/backup lamp assembly, unplug the tail/backup lamp harness grommet from the rear compartment lid.
4. Remove the tail/backup lamp from the vehicle.
5. Remove the backup lamp bulb from the lamp housing.

Scheme 171

1. Install the backup lamp bulb into the lamp housing.
2. While supporting the tail/backup lamp assembly, connect the electrical connector.
3. While supporting the tail/backup lamp assembly, install the tail/backup lamp harness grommet to the rear compartment lid.
4. Install the tail/backup lamp to the vehicle. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
5. Install the tail/backup lamp fasteners to the tail/backup lamp studs. Tighten the tail/backup lamp fasteners to 6 N.m (53 in lbs).
6. Connect the tail/backup lamp electrical connector.
7. Clip the electrical connector to the metal edge of the rear compartment lid.

1. Disconnect the tail/back up lamp harness connector from the from the body wiring harness.
2. Remove the tail/back up lamp assembly from the rear compartment lid.
3. While supporting the tail/back up lamp assembly, unplug the tail/back up lamp harness grommet from the rear compartment lid and remove the tail/back up lamp from the vehicle.
4. Remove the fastener securing the license plate lamp assembly to the tail/backup lamp assembly.
5. Remove the license plate lamp housing from the tail/backup lamp assembly.

Scheme 172

1. Install the license plate bulb socket into the lamp housing. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
2. Install the fastener in order to secure the license plate lamp to the tail/backup lamp assembly. Tighten the license plate lamp fastener to 2 N.m (18 in lbs).
3. While supporting the tail/back up lamp assembly, install the tail/back up lamp harness grommet to the rear compartment lid and install the tail/back up lamp.
4. Install the tail/back up lamp fasteners to the tail/back up lamp studs. Tighten the tail/back up lamp fasteners to 6 N.m (53 in lbs).
5. Connect the tail/back up lamp electrical connector.
6. Connect the tail/back up lamp harness connector and clip the connector to the metal edge of the rear compartment lid.

1. Disconnect the tail/back up lamp harness connector from the from the body wiring harness.
2. Remove the tail/back up lamp assembly from the rear compartment lid.
3. While supporting the tail/back up lamp assembly, unplug the tail/back up lamp harness grommet from the rear compartment lid and remove the tail/back up lamp from the vehicle.
4. Remove the license plate lamp bulb from the lamp housing.

Scheme 173

1. Install the license plate bulb into the lamp housing.
2. While supporting the tail/back up lamp assembly, install the tail/back up lamp harness grommet to the rear compartment lid and install the tail/back up lamp. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
3. Install the tail/back up lamp fasteners to the tail/back up lamp studs. Tighten the tail/back up lamp fasteners to 6 N.m (53 in lbs).
4. Connect the tail/back up lamp electrical connector.
5. Connect the tail/back up lamp harness connector and clip the connector to the metal edge of the rear compartment lid.

1. Remove the rear compartment sill plate. Refer to «COMPARTMENT SILL PLATE REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) in Body Rear End.
2. If removing the tail lamp for bulb replacement only, proceed to step 5 .
3. Disconnect the tail lamp connector.
4. Press the grommet out of the rear end panel.
5. Remove the fasteners securing the tail lamp assembly to the body.
6. Remove the tail lamp assembly from the body.
7. Twist the tail lamp socket counter clockwise to remove.
8. Replace the failed bulbs, if necessary.

Scheme 174

1. If the tail lamp was removed for bulb replacement only, proceed to step 4 .
2. Route the tail lamp connector and the grommet through the body.
3. Verify that the grommet is fully seated in the body rear end panel.
4. Install the tail lamp bulb into the tail lamp socket.
5. Align the tabs on the tail lamp socket to the notches in the tail lamp assembly.
6. Twist the tail lamp socket clockwise to secure the tail lamp socket to the tail lamp assembly.
7. Install the tail lamp assembly to the body. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
8. Install the fasteners that secure the tail lamp assembly to the body. Tighten the fasteners to 6 N.m (53 in lbs).
9. Connect the tail lamp connector.
10. Install the rear compartment sill plate. Refer to «COMPARTMENT SILL PLATE REPLACEMENT - REAR»(/buick/lesabre/viii-2000-2005/remont/exterior-body-panels/#body-rear-end) in Body Rear End.

1. Disconnect the tail/backup lamp harness connector from the from the body wiring harness.
2. Remove the tail/backup lamp assembly from the rear compartment lid.
3. While supporting the tail/backup lamp assembly, unplug the tail/backup lamp harness grommet from the rear compartment lid.
4. Remove tail/backup lamp from the vehicle.

Scheme 175

1. While supporting the tail/backup lamp assembly, install the tail/backup lamp harness grommet to the rear compartment lid.
2. Install the tail/backup lamp. CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
3. Install the tail/backup lamp fasteners to the tail/backup lamp studs. Tighten the tail/backup lamp fasteners to 6 N.m (53 in lbs).
4. Connect the tail/backup lamp electrical connector.
5. Connect the tail/backup lamp harness connector.
6. Clip the connector to the metal edge of the rear compartment lid.

Exterior Lamps

The exterior lighting consist of the following lamps

1. The Headlamps.
2. The Cornering Lamps.
3. The Daytime Running Lamps (DRL).
4. The Park, Tail, Licence and Marker Lamps.
5. The Turn Signal Lamps.
6. The Stop Lamps.
7. The Backup Lamps.

Headlamps

The headlamps may be turned on in three different ways. First, when the headlamp switch is placed in the ON position, for normal operation. Second, With the twilight switch placed in the ON position, for Automatic Lamp Control (ALC). And third, with the twilight switch placed in the ON position, with the windshield wipers ON in daylight conditions, after a 6 second delay. During ALC control the headlamps will be in Daytime Running Lamp (DRL) operation in daylight conditions, or low beam operation in low light conditions. The Dash Integration Module (DIM) provides battery positive voltage to the signal circuits of the headlamp switch. The signal circuits include the headlamp on input, the flash-to-pass feature, and the high beam input.

With the headlamp switch in the ON position, a ground path is available for the headlamp switch signal circuit of the DIM through the headlamp switch. The DIM provides ground to either the relay control circuit of the low beam circuit or the high beam circuit. The position of the dimmer switch determines which relay control circuit has ground. The DIM supplies battery positive voltage to the relay control circuits, if the headlamps are necessary. The underhood fuse block supplies battery positive voltage to both relay switch circuits. When the low beam relay control circuit is energized, current flow is to both low beam fuses and to the low beam headlamps. The headlamps have ground at G103 and at G401. When the high beam relay control circuit is energized, current flow is to both high beam fuses and to the high beam headlamps. The high beam circuit is divided into a left and right side circuit. The current flow of the left high beam is from the fuse to the left high beam lamp. From the lamp, the current flows to the normally-closed contact of the Daytime Running Lamp (DRL) relay to G103. The current flow of the right high beam is from the fuse to the right high beam lamp. From the lamp, the current flow is to ground at G401. When the headlamp dimmer switch lever is pulled toward the driver, the flash-to-pass switch closes. This grounds the DIM Flash-To-Pass input. In response to this input, the DIM energizes the high beam relay. Both high beams remain on until the driver releases the switch handle. If the low beam headlamps were on during a flash-to-pass operation, the low beams remain on. The headlights may be switched to high beam with the opposite movement of the dimmer switch lever.

Daytime Running Lamps (DRL)/Twilight Sentinel

Twilight sentinel is a driver convenience that controls the exterior lamps in response to changes to the outside (ambient) light level. The twilight sentinel will also keep the exterior lamps on for a pre-selected period of time after the ignition is turned to the OFF position with nighttime conditions sensed. The exterior lamps will be turned off automatically after the delay period elapses. The delay period ranges 0 seconds to 3 minutes in approximately 12 second increments. The twilight delay switch in the headlamp switch is supplied a reference voltage from the HVAC control module w/C67 or Instrument Panel Module (IPM) w/CJ2. It is supplied a reference ground from the HVAC control module or IPM. The switch is a potentiometer that resistance varies as the switch is moved. The HVAC control module or IPM receives an input voltage proportional to the resistance of the potentiometer. The HVAC control module or IPM sends a class 2 message to the Dash Integration Module (DIM) indicating the on/off status and delay length for the twilight sentinel. With the twilight sentinel in an ON position, the DIM will automatically control the headlamps on/off status depending on the night time/daytime status of the sunload sensor. The DIM will use the twilight sentinel delay length to know how long to keep the headlamps and park lamps on after the ignition switch transitions from ON to OFF during night time conditions. The sunload sensor is a light sensitive transistor that varies its voltage signal to the HVAC control module or IPM in response to changes to the outside (ambient) light level. When the HVAC control module or IPM receives this signal, the HVAC control module or IPM sends a class 2 message to the DIM and to the Rear Integration Module (RIM). When the twilight switch is in ON, the DIM either turns on the DRL or turns on the low beam headlights, after a 20 second delay depending on whether daylight or low light conditions are sensed. Any function or condition that turns on the headlights will cancel the DRL operation. The FOG/DRL fuse in the underhood fuse block supplies battery positive voltage to the switch circuit of the Daytime Running Lamp (DRL) relay. Battery positive voltage is also supplied to the DRL relay control circuit from the underhood fuse block which is energized by the DIM. When the DIM energizes the DRL relay control circuit, the current flows from the switch contacts of the DRL relay to the left high beam. After the left high beam, the current flows through the left high beam fuse and through the right high beam fuse. The current continues through the right high beam to ground G401. The high beam headlamps are now in series, and split the voltage. The headlamps illuminate at half intensity. The DRL operate when the ignition switch is in the RUN position, and the parking brake is not set or the transmission is not in park. When these conditions have been met and the sunload sensor indicates daytime conditions, the DRL will illuminate.

Park, Tail & Marker Lamps

The park lamps, including the license lamps, are turned on when the headlamp switch is placed in the PARK or ON position or anytime the headlights are requested. The rear fuse block supplies battery positive voltage to the switch contacts of the park lamp relay. When the headlamp switch is in PARK or in ON, the signal circuit of the park lamp switch of the DIM has a ground path. The DIM provides battery positive voltage to the control circuit of the park lamp relay. When the park lamps and/or the tail lamps are ON, the DIM energizes the park lamp relay control circuit. This closes the switch contacts. Current flows from the park lamp relay to the left park lamp fuse and to the right park lamp fuse. The current flows to the LH PARK LP and the RH PARK LP fuses. From the fuse, the current flows to the park lamps. The left park lamps are grounded at G103, at 401, and at G402. The right park lamps and the right tail lamps are grounded at G103, and at G401. The DIMR fuse supplies battery positive voltage to the license lamps and to the DIM park lamp input, for interior lamps dimming. The license lamps are grounded at G101.

Remote Keyless Entry Exterior Lamp Illumination

When the Remote Control Door Lock Receiver Module (RCDLR) receives a door UNLOCK command from the remote function actuator transmitter, the RCDLR will send a class 2 message to the Dash Integration Module (DIM). The DIM must have inputs that indicate that the ignition switch is OFF, all the doors are closed, and the ambient light sensor is indicating low light conditions. The DIM will then activate the headlamp relay and park lamp relay. The DIM will flash the headlamps and park lamps twice, then keep them on approximately 25 seconds or until a door is opened. When the RCDLR receives a door LOCK command from the remote function actuator transmitter, The DIM will flash the headlights and park lights once. In daylight conditions, the DIM will activate the park lamp relay only to flash the park lamps twice with a door UNLOCK command and once with a door LOCK command from the remote function actuator transmitter.

Turn Signal/Cornering Lamps

The T/SIG HAZ fuse in the rear fuse block supplies battery positive voltage to the flasher module. The flasher module has ground at G201. The turn signal lamps may only be activated with the ignition switch in the ON or ACCY position. The IGN-1 fuse in the rear fuse block supplies battery positive voltage to the turn signal switch. When the turn signal switch is placed in either the left or right position, current flow is from the turn signal switch assembly to the flasher module. The flasher module then sends an on-off voltage signal to either the left or right turn signals and their Instrument Panel Cluster (IPC) indicator. When the hazard switch is pressed, all the turn signal lamps will flash including both IPC turn signal indicators. The hazard and turn signal lamp flasher assembly is grounded at G201. The left turn signals have ground at G103 and at G402. The right turn signals have ground at G401. The turn signal switch supplies battery positive voltage to the cornering lamps, the left cornering lamp has ground at G103 and the right cornering lamp has ground at G401.

Stop Lamps

The STOP LP fuse in the rear fuse block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close. The battery positive voltage flows to the left stop lamp assemblies, to the right stop lamp assemblies, and to the Center High Mounted Stop Lamp (CHMSL). The left stop lamp has ground at G402. The right stop lamp and the CHMSL have ground at G401.

Backup Lamps

The rear fuse block supplies battery positive voltage to the control circuit and to the switch terminals of the reverse lamp relay. Battery positive voltage to the switch terminal is available through the NSBU fuse. The Dash Integration Module (DIM) sends a power mode message to the Rear Integration Module (RIM) indicating that the ignition is in the ON position. When the driver selects the REVERSE position, the Powertrain Control Module (PCM) sends a class 2 message to the RIM. The message indicates that the gear selector lever is in the REVERSE position. The RIM then energizes the reverse lamp relay and the backup lights illuminate. Current flows from the reverse lamp relay switch to the backup lamps. The backup lamps have ground at G401.

High Beam

The IPC illuminates the high beam indicator when the Dash Integration Module (DIM) detects that the high beams are requested. The IPC receives a class 2 message from the DIM requesting illumination.

High Beam (With HUD)

The Head Up Display (HUD) illuminates the high beam indicator when the Dash Integration Module (DIM) detects that the high beams are requested. The HUD receives a class 2 message from the DIM requesting illumination.

Turn Signals

The left and right turn signal indicators are hard wired to the turn signal switch and the hazard switch. The turn signal indicator illuminates when the turn signal lamps supply voltage circuit is active. If the IPC determines that the turn signal is active for more than 1.29 km (0.8 mile), the IPC sends a class 2 message to the radio in order to activate an audible warning.

Turn Signals (With HUD)

The left and right turn signal indicators in the Head Up Display (HUD) are hard wired to the turn signal switch and the hazard switch. The turn signal indicator illuminates when the turn signal lamps supply voltage circuit is active.

TURN SIGNAL ON? - 20 (With DIC)

The IPC illuminates the TURN SIGNAL ON? -20 indicator in the DIC when the IPC determines that the turn signal is active for more than 1.29 km (0.8 mile). The IPC also sends a class 2 message to the radio in order to activate an audible warning.

Battery Run Down Protection/Inadvertent Power

To provide battery run down protection, the exterior lamps will be deactivated automatically under certain conditions. The Dash Integration Module (DIM) monitors the state of the headlamp switch. If the park or headlamp switch is ON when the ignition switch is placed in either the CRANK or RUN position and then placed in the OFF position, the DIM initiates a 10 minute timer. At the end of the 10 minutes, the DIM will turn off the control power output to the park and headlamp relay coils, deactivating the exterior lamps. This feature will be cancelled if any power mode other than OFF becomes active. The DIM will disable battery run down protection if any of the following conditions exist. The park or headlamp switch is placed in the ON to OFF position, and back to the ON position during battery run down protection. The DIM determined that the park or headlamp switch was not active when the ignition was turned OFF.

Interior Lamps

The interior lighting consist of the following three groups.

This first group includes lamps that may not be dimmed.

1. The Courtesy/Reading Lamps.
2. The Dome lamps.
3. The IP and Rear Compartment Lamps.
4. The Vanity Mirror Lamps.

Courtesy/Illuminated Entry Lamps

The second group include lamps that may be manually turned on by placing the interior lamp switch in the ON position, or by opening a door.

1. The Roof Rail/Reading Lamps.
2. The Footwell Lamps.
3. The Dome Lamps.

The courtesy lamps, may be manually turned on by placing the interior lamp switch in the ON position, or by opening a door. The sunload sensor must indicate low light conditions for the interior lamps to operate, then the following scenarios will occur. When a front door is opened, the foot well, all door and the overhead console courtesy lamps turn on. If a rear door is opened, only the courtesy lights illuminate.

After all the doors have been closed the courtesy lamps will remain illuminated approximately 25 seconds after the last door closes. When the sunload sensor indicates daylight conditions, the interior courtesy lamps will not illuminate at all.

The INT LP fuse in the rear fuse block supplies battery positive voltage to the normally open switch contacts of the interior lamp relay. The INT LP fuse also supplies battery positive voltage to the interior lamp relay control circuit. The door modules communicate on a Simple Bus Interface (SBI). When you open any door, the switch contacts of the door jamb close. When a door open input is grounded, that door module sends a message to the Drivers Door Module (DDM) in order to indicate that a door is open. The DDM sends a class 2 message to the Rear Integration Module (RIM) in order to indicate which door is open. The RIM activates the interior lamp relay in order to provide battery positive voltage to the interior courtesy lamps. Depending on which doors are opened, front or rear, the proper interior courtesy lamps illuminate. The PIM provides a pulse width modulated ground to all interior courtesy lamps for the interior lights theater dimming feature. Some of the courtesy lamps are also used as reading lamps, each reading lamp may be manually turned on or off using it's own respective switch.

The courtesy lamps will normally turn off using the theater dimming feature. The courtesy lamps will also turn off immediately if an all door lock command is received with all the doors closed, or if the ignition switch is turned to either the ON or RUN position.

After the deployment of the Supplemental Inflatable Restraint (SIR) system, all courtesy lamps will illuminate after an approximate 15 second delay period. The courtesy lamps can only be deactivated, or turned off, after the ignition switch is placed in the OFF position.

Keyless Entry Interior Illumination

When the Remote Control Door Lock Receiver Module (RCDLR) receives a door unlock command from the RFA transmitter, the RCDLR will send a class 2 message to the Rear Integration Module (RIM) indicating that an UNLOCK command has been received. The RIM must have inputs that indicate that the ignition switch is OFF, all the doors are closed, and the ambient light sensor is indicating low light conditions. The RIM will then activate the interior lamp relay, providing battery positive voltage and also a Pulse Width Modulated (PWM) ground to the interior lamps. The RIM will keep the courtesy lamps on approximately 40 seconds and then turn them off through the theater dimming feature. If the door locks are activated to the LOCK position, or if the ignition switch is turned to either the ON or RUN position the courtesy lamps will deactivate immediately. When the sunload sensor indicates daylight conditions, the interior courtesy lamps will not illuminate at all.

IP Compartment Lamp

The RIM energizes the interior lamp relay which provides battery positive voltage to the instrument panel compartment lamp. When the IP compartment (glove box) is opened, its switch closes to provide a ground circuit and the IP compartment lamp illuminates.

Rear Compartment Lamp

The RIM energizes the interior lamp relay which provides battery positive voltage to the rear compartment lamp. When the rear compartment is opened, its switch closes to provide a ground circuit and the rear compartment lamp illuminates.

Vanity Lamps

The RIM energizes the interior lamp relay which provides battery positive voltage to the vanity mirror lamps. When the vanity mirror cover on the sunshade is opened, its switch closes to provide a ground circuit and the vanity lamp illuminates. The vanity mirror lamp may be dimmed by the sliding switch next to the mirror.

Interior Lamps Dimming

The third group includes lamps which may be dimmed. This group may use a combination of Vacuum Fluorescent (VF) illumination and of incandescent lamps.

1. The door switches and the window switches.
2. The driver information center.
3. The heated seat switches.
4. The headlamp switch.
5. The HVAC control head assemblies.
6. The radio.
7. The Instrument Panel Cluster (IPC).
8. The steering wheel control switches.

When the ignition switch is turned to the ON position, the Vacuum Fluorescent (VF) displays turn on at maximum brightness. When the park lamps are on and the sunload sensor indicates low light conditions, all incandescent back lighting turn on at the dimming level indicated by the IP dimmer switch. At the same time all Vacuum Fluorescent (VF) displays dim to match the indicated dimming level. The rear fuse block supplies battery positive voltage to the normally open switch of the park lamp relay. The Dash Integration Module (DIM) supplies battery positive voltage to the park lamp relay control circuit. The DIM also provides ground to the relay control circuit. When the DIM energizes the park lamp relay, current flow from switch goes through the DIMR fuse to the incandescent dimming circuit of the DIM. With the park lamps on, the DIM sends proportional voltage to the circuit in response to an input from the HVAC control module with C67 or Instrument Panel Module (IPM) with CJ2. The potentiometer of the IP dimmer switch receives a reference voltage and ground from the HVAC control module or IPM. The potentiometer is an input to the HVAC control module or IPM. When the driver selects a dimming setting, the HVAC control module or IPM responds with a message to the DIM indicating this setting. All Vacuum Fluorescent (VF) lamps and all incandescent back lighting lamps have voltage and ground at G200 and at G201. When the IP dimmer switch is moved from MIN to MAX, all Vacuum Fluorescent (VF) displays, as well as all incandescent back lighting respond from minimum intensity to maximum brightness in response to the IP dimmer switch.

The incandescent back lighting for the doors also operate in response to a class 2 message regarding dimming intensity. The HVAC control module or IPM sends the message to the Driver Door Module (DDM). The DDM sends an SBI message regarding dimming intensity to all the other door modules.

The driver may select parade mode by manually turning on the park lamps during daylight conditions. The front park lamp circuit supplies voltage to the instrument panel cluster, radio and HVAC assembly for a park lamp on input, and the displays will become full bright.

To provide battery run down protection, the interior lamps will be deactivated automatically under certain conditions. The Rear Integration Module (RIM) initiates a 10 minute timer if the interior lamp relay control output is still active and the ignition switch is in the OFF position. The RIM timer is set to 3 minutes until the vehicle mileage is above 20.3-24.7 km (12.6-15.4 mi). At the end of the designated time, the RIM will deactivate the interior lamp relay, disabling the interior lamps. This feature will be cancelled if any power mode other than OFF becomes active. The RIM will reset the timer if any interior lamp switch is turned on, a door is opened or the Remote Control Door Lock Receiver (RCDLR) is activated.

See also:
• TESTING FOR INTERMITTENT & POOR CONNECTIONS
• DISABLING SYSTEM
• TRIM PLATE REPLACEMENT - IP ACCESSORY LEFT
• TRIM PANEL REPLACEMENT - REAR WINDOW SHELF
• COMPARTMENT SILL PLATE REPLACEMENT - REAR
• DIAGNOSTIC SYSTEM CHECK - LIGHTING SYSTEMS
• CHECKING AFTERMARKET ACCESSORIES