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Headlights - Automatic Control Chevrolet Malibu V

Headlights ~2000 words

DESCRIPTION

Note. Body Control Module (BCM) may also be referred to as Body Function Controller (BFC).

Body Control Module (BCM) controls operation of Daytime Running Lights (DRL), automatic lamp control and foglights. BCM monitors available light levels through an ambient light sensor to determine when to energize automatic lamp control relay.

SERVICE PRECAUTIONS - HANDLING

CAUTIONWhen handling Electrostatic Discharge (ESD) sensitive electronic parts (control modules), take special care to avoid damaging components.
  1. Discharge personal static electricity by momentarily touching metal grounding point on vehicle before touching electronic components.
  2. DO NOT touch terminals on components or connectors with fingers or metal tools. When unplugging connectors, DO NOT let metal tool contact any exposed terminal.
  3. Never jumper, ground, or use test probes on components or connectors unless specified in diagnosis. Always connect ground lead first.
  4. DO NOT remove solid-state components from protective packaging until ready for installation. Touch packaging to ground before opening.
  5. DO NOT bump or drop components. DO NOT put component on metal work bench, metal objects, or electrically operated components (such as radio, TV, or oscilloscope).

COMPONENT LOCATIONS

ApplicationLocation
Automatic Lamp Control RelayIn Underhood Wiring Harness Junction Block
Body Control Module (BCM) (1)Below Right Side Of Instrument Panel
Daytime Running Light (DRL) RelayIn Underhood Wiring Harness Junction Block
Daytime Running Light (DRL) ResistorRear Of Front Impact Bar
Ground Splice Pack G101Left Side Of Engine Compartment
Ground Splice Pack G201Left Side Of Instrument Panel
Ground Splice Pack G204Right Side Of Instrument Panel
Right-Side Instrument Panel Wiring Harness Junction BlockRight Side Of Instrument Panel
Turn/Headlight Switch AssemblyLeft Side Of Steering Column
Underhood Wiring Harness Junction BlockLeft Side Of Engine Compartment
(1) Body Control Module (BCM) may also be referred to as Body Function Controller (BFC).
(1)Body Control Module (BCM) may also be referred to as Body Function Controller (BFC).

COMPONENT LOCATIONS

TROUBLE SHOOTING

  1. Check RH HDLP fuse (15-amp), LH HDLP fuse (15-amp) and HTR A/C IGN fuse (10-amp) in underhood wiring harness junction block. If foglights do not operate properly, check FOG LPS fuse (10-amp) in right instrument panel wiring harness junction block.
  2. Using scan tool, check for BCM Diagnostic Trouble Codes (DTCs). If any BCM DTCs are set, see «BODY CONTROL MODULES»(/chevrolet/malibu/v-1996-2000/remont/body-cab-control-systems/#body-control-module) article.
  3. If one headlight or foglight does not work, check bulb, connections and related wiring. See appropriate wiring diagram in HEADLIGHT SYSTEMS & DAYTIME RUNNING LIGHTS article. Ensure all ground connections are clean and tight.
  4. Check for poor connections or partially broken wire inside of insulation which could cause an intermittent. Check for proper installation of aftermarket electronic equipment.

SYSTEM TESTING

WARNINGBefore servicing instrument panel components on vehicles with Supplemental Inflatable Restraint (SIR) system, disable SIR system. See DISABLING & ACTIVATING AIR BAG SYSTEM in AIR BAG RESTRAINT SYSTEMS article.

Note. Unless otherwise specified, make all measurements with a Digital Volt-Ohmmeter (DVOM) with an input impedance of 10 megohms.

Note. To locate components, see COMPONENT LOCATIONS .

Both Low Beam Headlights Inoperative

  1. Using test light, backprobe between underhood wiring harness junction block Brown, 68-pin connector C3, terminal A12 (Dark Blue wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 3).
  2. Using test light, backprobe between turn/headlight switch assembly Black, 6-pin connector C1, terminal No. 34 (Dark Blue wire) and ground. If test light illuminates, go to step 4). If test light does not illuminate, go to step 5).
  3. Replace underhood wiring harness junction block. Recheck system operation.
  4. Replace turn/headlight switch assembly. See «STEERING COLUMN SWITCHES»(/chevrolet/malibu/v-1996-2000/remont/steering-column-switches/#steering-column-switches) article. Recheck system operation.
  5. Repair open in circuit No. 1201 (Dark Blue wire) between turn/headlight switch assembly and underhood wiring harness junction block. Recheck system operation.

Both High Beam Headlights Inoperative

  1. Using test light, backprobe between underhood wiring harness junction block Brown, 68-pin connector C3, terminal B7 (Pink wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 3).
  2. Using test light, backprobe between turn/headlight switch assembly Black, 6-pin connector C1, terminal No. 33 (Pink wire) and ground. If test light illuminates, go to step 4). If test light does not illuminate, go to step 5).
  3. Replace underhood wiring harness junction block. Recheck system operation.
  4. Replace turn/headlight switch assembly. See «STEERING COLUMN SWITCHES»(/chevrolet/malibu/v-1996-2000/remont/steering-column-switches/#steering-column-switches) article. Recheck system operation.
  5. Repair open in circuit No. 1200 (Pink wire) between turn/headlight switch assembly and underhood wiring harness junction block. Recheck system operation.

Both Low Beam & High Beam Headlights Inoperative, But DRL Operates Normally

  1. Using test light, backprobe between turn/headlight switch assembly Black, 6-pin connector C1, terminal No. 35 (Black wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 3).
  2. Repair open in circuit No. 150 (Black wire) between turn/headlight switch assembly and ground splice pack G201. Recheck system operation.
  3. Replace turn/headlight switch assembly. See «STEERING COLUMN SWITCHES»(/chevrolet/malibu/v-1996-2000/remont/steering-column-switches/#steering-column-switches) article. Recheck system operation.

Headlights Do Not Turn Off

  1. Disconnect turn/headlight switch assembly Black, 6-pin connector C1. If headlight turn off, go to next step. If headlights do not turn off, go to step 3).
  2. Using DVOM, check resistance between turn/headlight switch assembly harness connector C1, terminals No. 33 (Pink wire) and No. 35 (Black wire). Check resistance between turn/headlight switch assembly harness connector C1, terminals No. 34 (Dark Blue wire) and No. 35 (Black wire). If resistance is infinite at both terminals, go to step 4). If resistance is not infinite at both terminals, go to step 5).
  3. Disconnect underhood wiring harness junction block Brown, 68-pin connector C3. If headlights turn off, go to step 6). If headlights do not turn off, go to step 7).
  4. Locate and repair problem in BCM system. See «BODY CONTROL MODULES»(/chevrolet/malibu/v-1996-2000/remont/body-cab-control-systems/#body-control-module) article. Recheck system operation.
  5. Replace turn/headlight switch assembly. See «STEERING COLUMN SWITCHES»(/chevrolet/malibu/v-1996-2000/remont/steering-column-switches/#steering-column-switches) article. Recheck system operation.
  6. If low beams are on, repair short to ground in circuit No. 1201 (Dark Blue wire) between turn/headlight switch assembly and underhood wiring harness junction block. If high beams are on, repair short to ground in circuit No. 1200 (Pink wire) between turn/headlight switch assembly and underhood wiring harness junction block. Recheck system operation.
  7. Disconnect underhood wiring harness junction block Black, 68-pin connector C2. If headlights turn off, go to next step. If headlights do not turn off, go to step 9).
  8. Replace underhood wiring harness junction block. Recheck system operation.
  9. If low beams are on, repair short to ground in circuit No. 1201 (Dark Blue wire) between underhood wiring harness junction block and any illuminated headlight. If high beams are on, repair short to ground in circuit No. 1200 (Pink wire) between underhood wiring harness junction block and any illuminated headlight. Recheck system operation.

Foglights Are Inoperative

  1. Using scan tool, check for BCM Diagnostic Trouble Codes (DTCs). If no BCM DTCs exist, go to next step. If BCM DTCs exist, go to step 3).
  2. Connect scan tool. Turn headlight switch to PARK position. Using scan tool, command foglights on. If foglights illuminate, go to step 4). If foglights do not illuminate, go to step 5).
  3. Repair problem in BCM system. See «BODY CONTROL MODULES»(/chevrolet/malibu/v-1996-2000/remont/body-cab-control-systems/#body-control-module) article. Recheck system operation.
  4. Using a fused jumper wire, backprobe between BCM Pink, 24-pin connector C3, terminal A4 (Orange wire) and ground. If scan tool displays foglight input is ON, go to step 6). If scan tool does not display foglight input is ON, go to step 7).
  5. Remove foglight relay from right-side instrument panel wiring junction block. Replace with known-good relay. Using scan tool, command foglights on. If foglights illuminate, go to step 8). If foglights do not illuminate, go to step 9).
  6. Disconnect foglight switch connector. Connect a fused jumper wire between Orange wire terminal at foglight switch harness connector and ground. If scan tool displays foglight input is ON, go to step 10). If scan tool does not display foglight input is ON, go to step 11).
  7. Replace BCM. See «BODY CONTROL MODULES»(/chevrolet/malibu/v-1996-2000/remont/body-cab-control-systems/#body-control-module) article. Recheck system operation.
  8. Replace faulty foglight relay. Recheck system operation.
  9. Replace right-side instrument panel wiring junction block. Recheck system operation.
  10. Connect a fused jumper wire between Orange and Black/White wire terminals at foglight switch harness connector. If scan tool displays foglight input is ON, go to step 12). If scan tool does not display foglight input is ON, go to step 13).
  11. Repair open in circuit No. 192 (Orange wire) between foglight switch and BCM connector C3. Recheck system operation.
  12. Replace foglight switch. Recheck system operation.
  13. Repair open in circuit No. 251 (Black/White wire) between foglight switch and ground splice pack G204. Recheck system operation.

Headlights Do Not Come On Automatically When Dark

  1. Using scan tool, check for BCM Diagnostic Trouble Codes (DTCs). If no BCM DTCs exist, go to next step. If BCM DTCs exist, go to step 12).
  2. Using scan tool, command automatic lamp control on. If headlights turn on, go to step 12). If headlights do not turn on, go to next step.
  3. Using test light, backprobe between turn/headlight switch assembly Black, 6-pin connector C1, terminal No. 36 (Dark Green wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 5).
  4. Remove automatic lamp control relay from underhood wiring harness junction block. Install known-good relay. Using scan tool, command automatic lamp control ON. If headlights turn on, go to step 6). If headlights do not turn on, go to step 7).
  5. Replace turn/headlight switch assembly. See «STEERING COLUMN SWITCHES»(/chevrolet/malibu/v-1996-2000/remont/steering-column-switches/#steering-column-switches) article. Recheck system operation.
  6. Replace faulty automatic lamp control relay. Recheck system operation.
  7. Using test light, backprobe between underhood wiring harness junction block Brown, 68-pin connector C3, terminal B3 (Dark Green wire) and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 9).
  8. Using DVOM to check resistance, backprobe between underhood wiring harness junction block connector C3, terminal A10 (Black wire) and ground. If resistance is 0-2 ohms, go to step 10). If resistance is not 0-2 ohms, go to step 11).
  9. Repair open in circuit No. 306 (Dark Green wire) between underhood wiring harness junction block connector C3 and turn/headlight switch assembly. Recheck system operation.
  10. Connect a fused jumper wire between underhood wiring harness junction block connector C3, terminal C11 (Pink/White wire) and ground. If headlights turn on, go to step 12). If headlights do not turn on, go to step 13).
  11. Repair open in circuit No. 150 (Black wire) between underhood wiring harness junction block connector C3 and ground splice pack G201. Recheck system operation.
  12. Repair problem in BCM system. See «BODY CONTROL MODULES»(/chevrolet/malibu/v-1996-2000/remont/body-cab-control-systems/#body-control-module) article. Recheck system operation.
  13. Replace underhood wiring harness junction block. Recheck system operation.

Daytime Running Lights (DRL) Inoperative, But Headlights Operate Properly

  1. Using scan tool, check for BCM Diagnostic Trouble Codes (DTCs). If no BCM DTCs exist, go to next step. If BCM DTCs exist, go to step 3).
  2. Connect scan tool. Using scan tool, command DRL on. If DRL turn on, go to next step. If DRL do not turn on, go to step 4).
  3. Repair problem in BCM system. See «BODY CONTROL MODULES»(/chevrolet/malibu/v-1996-2000/remont/body-cab-control-systems/#body-control-module) article. Recheck system operation.
  4. Remove DRL relay from underhood wiring harness junction block. Install known-good relay. Using scan tool, command DRL on. If DRL turn on, go to next step. If DRL do not turn on, go to step 6).
  5. Replace faulty DRL relay. Recheck system operation.
  6. Using DVOM to check resistance, backprobe between underhood wiring harness junction block Black, 68-pin connector C2, terminal D11 (Gray wire) and ground. If resistance is 0-2 ohms, go to next step. If resistance is not 0-2 ohms, go to step 8).
  7. Connect a fused jumper wire between underhood wiring harness junction block Brown, 68-pin connector C3, terminal B12 (Light Green/Black wire) and ground. If DRL turn on, go to step 9). If DRL do not turn on, go to step 10).
  8. Disconnect DRL resistor. Using DVOM, check resistance between DRL resistor harness connector terminals "A" (Gray wire) and "B" (Black wire). If resistance is 0.25-0.37 ohms, go to step 12). If resistance is not 0.25-0.37 ohms, go to step 11).
  9. Repair open in circuit No. 592 (Light Green/Black wire) between underhood wiring harness junction block and BCM connector C1. Recheck system operation.
  10. Replace underhood wiring harness junction block. Recheck system operation.
  11. Using DVOM, check resistance between DRL resistor harness connector terminal "B" (Black wire) and ground. If resistance is 0-2 ohms, go to step 13). If resistance is not 0-2 ohms, go to step 14).
  12. Replace DRL resistor. Recheck system operation.
  13. Repair open in circuit No. 589 (Gray wire) between DRL resistor and underhood wiring harness junction block connector C2. Recheck system operation.
  14. Repair open in circuit No. 1350 (Black wire) between DRL resistor and ground splice pack G101. Recheck system operation.

REMOVAL & INSTALLATION

WARNINGBefore servicing instrument panel components on vehicles with Supplemental Inflatable Restraint (SIR) system, disable SIR system. See DISABLING & ACTIVATING AIR BAG SYSTEM in AIR BAG RESTRAINT SYSTEMS article.
CAUTIONWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in the GENERAL INFORMATION section before disconnecting battery.

Note. No removal or installation procedures are available from manufacturer at time of publication.

WIRING DIAGRAMS

Note. For automatic headlight system wiring diagrams, see HEADLIGHT SYSTEMS & DAYTIME RUNNING LIGHTS article.