SERVICE MANUAL UPDATE-SEC. 8A MID-YEAR VEHICLE DESIGN CHANGE

Models Affected: 1990 LEMANS

SERVICE MANUAL UPDATE

The attached pages are revisions to Section 8A of the 1990 Pontiac LeMans Service Manual. These revisions reflect mid-year vehicle design changes, and therefore serve to supplement (not replace) the existing Section 8A.

Service Manual Revision Page Page Air Conditioning Air Delivery....................65-0 Blower Controls.................63-0............63-0,63-1 Compressor Controls.............64-0............64-0,64-1 System Check....................62-0 Alarms...........................75-0 Automatic Safety Belts..........146-0...........146-1 Brake Warning System.............41-0 Charging System..................30-0............30-0 Cigar Lighter...................114-0 Component Location List.........200-0.....200,0,200-1,200-2,200-3 Component Location Views........201-0 Coolant Fan With Air Conditioning...........31-0............31-0 Without Air Conditioning........31-2 Cruise Control...................34-0 Engine control Throttle Body Injection: L4 VIN 6, L4 VIN K..............20-0........20-1,20-2,20-3 Fog Lights......................100-1 Fuse Block Details Fuse 1..........................11-1 Fuse 2..........................11-1 Fuse 3..........................11-1 Fuse 4..........................11-1 Fuse 5..........................11-1 Fuse 6..........................11-1 Fuse 7..........................11-6 Fuse 8..........................11-3 Fuse 9..........................11-3 Fuse 10.........................11-6 Fuse 11.........................11-4 Fuse 12.........................11-2................11-2 Fuse 13.........................11-2................11-2 Fuse 14.........................11-5 Fuse 15.........................11-6 Fuse 16.........................11-6 Fuse 17.........................11-6 Fuse 18.........................11-6 Fuse 19.........................11-3 Gages Gages Cluster...................81-0.............81-1,81-2 Coolant Temperature.............81-2 Fuel............................81-2 Tachometer......................81-0 Ground Disbirbution..............14-0...14-0,14-1,14-3,14-4,14-5 Harness Connector Faces.........202-0 Harness Routing Views...........203-0 Headlights: Without T61.........100-0 Headlights: with T61............104-0...................104-0 Heater...........................60-0...............60-0,60-1 Horns............................40-0 Indicators Gages Cluster...................81-0 Brake...........................81-1 Charge..........................81-0 Check Engine....................81-2 Fasten Belts....................81-1.................81-1,81-2 Hi Beam.........................81-1 LH and RH Turn..................81-1 Oil Pressure....................81-0 Running Light...................81-1.......................81-1 Upshift.........................81-2.......................81-1 Instrument Panel Gages Cluster...................81-0...................81-1,81-2 Interior Lights Dimming.........117-0.......................117-0

Introduction..................... 2-0 Light Switch Details............ 12-0 .......................12-1 Lights: Exterior Back Up.......................112-0 Fog...........................100-1 Front Park....................110-3 Hazard........................110-1 Headlights: Without T61.......100-0 Headlights: With T61..........104-0 ......................104-0 High Level Stop...............110-0 License Plate.................110-3 Side Marker...................110-3 Stop..........................110-0 Tail..........................110-3 Turn..........................110-1 Lights: Interior Ashtray.......................114-1 Cargo.........................114-0 Dome..........................114-0 Engine Compartment............114-1 Gear Selector Illumination....117-0 Illumination..................117-0 ......................117-0 I/P Compartment...............114-1 Lights Dimming................117-0 ..................... 117-0 Power Distribution.............. 10-0 .................10-0, 10-1 Radio...........................150-0 Rear Defogger....................61-0 Repair Procedures.................5-0 Starter..........................30-0 .......................30-0 Symbols...........................3-0 Throttle Body Injection: L4 VIN 6, L4 VIN K.............20-0 .............20-1,20-2,20-3 Troubleshooting Procedures........4-0 Vehicle Speed Sensor.............33-0 Warnings.........................75-0 Wiper/Washer.....................91-0

COMPONENTS Page-Figure

A/C Compressor Clutch ............. Lower RH front of engine....... 201-1-D A/C Compressor Clutch Diode........ In A/C Compressor Clutch connector A/C High Pressure Cut-Out Switch... Lower RH front of engine,.......201-1-D LH side of A/C compresso A/C Low Pressure Cut-Out Switch.... Lower RH front corner of....... 201-0-A engine compartment, on A/C line Assembly Line Diagnostic Link.......At RH shroud, above Electronic..201-3-D (ALDL) Connector....................Control Module Back Up Lights Switch...............LH rear of engine compartment, on transaxle Blower Motor........................RH front of dash................201-0-A Blower Resistors....................RH front of dash................201-0-A Brake Fluid Level Switch............Rear of engine compartment,.....201-0-A top of brake fluid reservoir Brake Switch........................Top of brake pedal support......201-5-B Cargo Light Switch..................LH rear corner of cargo compartment Clutch Switch.......................Top of clutch pedal support.....201-7-B Contact Assembly....................At rear of hatchback lid and....201-7-A top of end panel Coolant Fan.........................Front of engine compartment, behind radiator Coolant Fan Resistor................LH side of engine compartment,..201-0-A by battery Coolant Temperature Sender..........On intake manifold..............201-3-C Coolant Temperature Sensor..........Top rear of engine, on intake...201-3-C (VIN 6) manifold, directly below throttle body Coolant Temperature Sensor..........Front LH side of engine, below Electronic Spark Timing (EST) (VIN K) Distributor ....................201-1-B Daytime Running Lights Relay ...... Behind center of I/P Defrost Valve Vacuum Actuator.......Behind center of I/P, on A/C plenum Electronic Control Module (ECM).....At RH shroud ...................201-3-D Electronic Spark Timing (EST).......Top LH side of engine ..........201-2-A Distributor Fuel Injector.......................Top of engine, top of throttle..201-2-A body Fuel Tank Unit......................Top of fuel tank, below rear....201-5-C seat Fuse Block..........................Behind LH side of I/P....... 201-5-A Fusible Link A......................Lower rear of engine, at........201-3-A Starter Solenoid Fusible Link B......................LH side of engine compartment,..201-0-A ahead of strut tower Generator...........................Top RH rear of engine....... 201-3-A Heater/A/C Bi-Directional...........Behind center of I/P, on A/C Vacuum Actuator plenum High Pressure Switch................Lower RH front of engine, LH....201-1-D side of A/C compressor Horn Brush..........................Top of steering column, below...201-6-C steering wheel I/P Compartment Light Switch........Behind LH side of I/P, top of...201-3-B I/P compartment Idle Air Control Valve..............Top of engine, RH side of.......201-2-A throttle body Ignition Coil.......................LH side of engine compartment,..201-2-A front of strut tower Ignition Switch.....................RH side of steering column......201-6-D Jamb Switch.........................At rear of each respective shroud

LH B-Pillar Switch ................ In LH center pillar LH Safety Belt Retractor............Next to driver's seat, in Solenoid seat belt retractor housing LH Shoulder and Belt............... In LH center pillar Switch LH Shoulder Belt Motor..............In LH center pillar and LH A-Pillar Switch Manifold Absolute Pressure..........Center front of dash........... 201-2-A (MAP) Sensor Multi-Function Lever................LH side of I/P, on steering.... 201-6-C column Oil Pressure/Fuel Pump Switch.......Lower RH rear of engine.........201-3-A Outside Air Valve Vacuum........... Behind center of I/P, on....... 201-1-E Actuator RH side of A/C plenum Oxygen Sensor .....................Lower front of engine, on...... 201-2-A exhaust manifold Park Brake Switch ..................In console, at base of park.... 201-6-A brake lever Passive Restraint Control.......... Behind RH side of I/P Module RH B-Pillar Switch .................In RH center pillar RH Safety Belt Retractor........... Next to front passenger's Solenoid seat, in seat belt retractor housing RH Shoulder Belt Motor and......... In RH center pillar RH A-Pillar Switch Safety Belt Switch .................In drivers seatbelt assembly... 201-6-A Starter Solenoid ...................Lower rear of engine............201-3-A Throttle Position Sensor............Top of engine, LH side of.......201-2-A throttle body Transaxle Position Switch...........LH side of engine compartment,..201-3-A on top of transaxle Vacuum Release Valve............... On brake pedal support Vehicle Speed Sensor................LH side of engine compartment,..201-3-A on rear of transaxle Vehicle Speed Sensor Buffer.........On clutch pedal support.........201-4-A Washer Pump ........................LH rear of corner of engine.....201-2-A compartment Windshield Wiper Motor............. LH front of dash............... 201-1-C CONNECTORS C102(3 cavities)....................LH side of engine compartment,..201-1-A above transaxle C103(2 cavities) ...................RH front corner of engine.......201-0-A compartment C113 (1 cavity)................... Lower LH front of engine........201-2-A C115 (14 cavities)..................LH side of engine compartment,..201-0-A front of battery C116 (1 cavity).....................LH side of engine compartment,..201-0-A forward of battery C125 (8 cavities) ..................LH side of engine compartment...201-0-A C200 (14 cavities) ................ Behind RH side of I/P...........201-3-D C203 (8 Cavities) ..................Behind LH side of I/P, near.....201-4-A clutch pedal support C223 (4 cavities) ..................Behind LH side of I/P, near.....201-4-A clutch pedal support C240 (2 cavities) ..................Behind LH side of I/P, near clutch pedal support C250 (5 cavities) ..................Behind RH side of I/P C300 (30 cavities) .................At bottom of LH shroud..........201-6-A C301 (6 cavities) ..................At bottom of LH shroud..........201-6-A C302 (1 cavity) ...................Behind LH side of I/P,..........201-4-A near brake pedal

C310 (9 cavities) ..................At base of LH center pillar C311 (9 cavities) ..................At base of RH center pillar C401 (3 cavities) ..................Center of end panel.............201-6-B C402 (2 cavities) ..................LH side of cargo compartment....201-7-A C405 (2 cavities) ................. LH side of cargo compartment C406 (2 cavities) (Notchback).......Top of RH rear roof pillar C406 (2 cavities) (Hatchback).......RH side of cargo compartment GROUNDS G101................................Rear of engine, near Starter Solenoid G102................................Top RH side of engine, on intake manifold G103................................Top RH side of engine, on cylinder head G104................................LH front corner of engine.......201-0-A compartment G105................................Behind LH side of I/P, on.......201-4-A clutch pedal support G110................................LH front corner of engine.......201-0-A compartment G200................................Behind LH side of I/P,..........201-5-A behind Fuse Block G300................................Below console, at base of.......201-6-A gear shift lever G400................................Center of end panel.............201-6-B G402 (Notchback)....................At LH rear quarter panel G402 (Hatchback)....................At LH side of glass, GROMMETS underside of hatch P100................................LH front of dash................201-0-A P101................................Behind RH side of I/P...........201-3-D P200................................Lower LH front of dash..........201-0-A P400................................Center of end panel.............201-6-B P401................................Below RH side of rear seat......201-6-A P402................................Top of LH quarter panel.........201-7-A SPLICES S102................................TBI harness, behind.............201-3-D RH side of I/P S103................................Front harness, LH front of......201-0-A engine compartment S104................................Front harness, below RH.........201-0-A side of radiator S105................................TBI harness, behind RH..........201-3-D side of I/P S106................................Front harness, below............201-0-A RH side of radiator S107................................Front harness, lower RH........ 201-0-A front of engine compartment S108................................Front harness, LH front of......201-0-A engine compartment S110................................Front harness, front of.........201-0-A engine compartment S111................................TBI harness, behind RH..........201-3-D side of I/P S113................................TBI harness, behind RH..........201-3-D side of I/P

S115 ..............................Front harness, right of.........201-0-A LH headlights S116 ..............................Front harness, left of......... 201-0-A RH headlights S117 ..............................Front harness, near horn....... 201-0-A S118 ..............................I/P harness, behind LH..........201-5-A side of I/P S119 ..............................I/P harness, behind LH..........201-5-A side of I/P S150 ..............................Cruise control harness, behind LH side of I/P S200 ..............................I/P harness, behind LH..........201-5-A side of I/P S201 ..............................I/P harness, behind LH..........201-5-A side of I/P S203 ..............................I/P harness, behind.............201-3-B center of I/P S204 ..............................I/P harness, behind LH .........201-5-A side of I/P S206 ..............................I/P harness, behind LH..........201-5-A side of I/P S207 ..............................I/P harness, behind.............201-5-A instrument cluster S208 ..............................I/P harness, behind.............201-5-A LH side of I/P S209 ..............................I/P harness, behind.............201-5-A LH side of I/P S210 ..............................I/P harness, behind LH..........201-5-A side of I/P S211 ..............................I/P harness, behind LH..........201-5-A side of I/P S212 ..............................I/P harness, behind LH..........201-5-A side of I/P S213 ..............................I/P harness, behind LH..........201-5-A side of I/P S214 ..............................I/P harness, behind LH..........201-5-A side of I/P S215 ..............................I/P harness, behind LH..........201-5-A side of I/P S216 ..............................I/P harness, behind LH..........201-5-A side of I/P S217 ..............................I/P harness, behind LH..........201-5-A side of I/P S220 ..............................TBI harness, behind RH......... 201-3-D side of I/P S221 ..............................TBI harness, behind RH..........201-3-D side of I/P S222 ..............................TBI harness, behind RH..........201-3-D side of I/P S230 ..............................Cruise control harness, behind LH side of I/P S231 ..............................I/P harness, behind RH side of I/P S232 ..............................I/P harness, behind LH side of I/P S233 ..............................I/P harness, behind LH side of I/P S234 ..............................I/P harness, behind LH side of I/P S235 ..............................I/P harness, behind LH side of I/P S400 ..............................Rear harness, LH rear ..........201-6-B corner of cargo compartment S401 ..............................Rear end harness, behind........201-7-A license plate S402 ..............................Rear end harness, behind........201-7-A license plate S403 ..............................Rear harness, LH rear corner....201-6-B of cargo compartment S404 ..............................Rear harness, LH rear corner....201-6-B of cargo compartment S405 ..............................Below RH rear seat............. 201-6-A

S406 ..............................Rear harness, LH rear ..........201-6-B corner of cargo compartment

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.