1988ELECTRICALDIAGNOSIS

MANUALSUPPLEMENT

TO5T..364..88 EDM CORVETTE

ELECTRICAL DIAGNOSIS SERVICE MANUAL

CHEVROLET

5T-364-885

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ELECTRICAL DIAGNOSISMANUAL SUPPLEMENT

FOREWORDCAUTION

To reduce the chance of personal injury and/or property dam­age the following instructions must be carefully observed:

Proper service and repair are important to the safety of theservice technician and the safe. reliable operation of all mo­tor vehicles. If part replacement is necessary. the part mustbe replaced with one of the same part number or with anequivalent part. Do not use a replacement part of lesserquality.

The service procedures recommended and described in thisservice manual are effective methods of performing serviceand repair. Some of these procedures require the use of toolsspecially designed for the purpose.

Accordingly. anyone who intends to use a replacement part.service procedure or tool. which is not recommended by thevehicle manufacturer. must first determine that neither hissafety nor the safe operation of the vehicle will be jeopard­ized by the replacement part. service procedure or toolselected.

It is important to note that this manual contains various"Cautions" and "Notices" that must be carefully observedin order to reduce the risk of personal injury during serviceor repair. or the possibility that improper service or repairmay damage the vehicle or render it unsafe. It is also im­portant to understand that these "Cautions" and "Notices"are not eKhaustive. because it is impossible to warn of allthe possible hazardous consequences that might result fromfailure to follow these instructions.

! :11) I

CHEVROLET

SERVICE

General Motors Corp. 4/89

This manual provides revised, and/or late productioninformation to supplement the 1988 Corvette Elec­trical Diagnostic Manual (ST -364-88 EDM) printed inSeptember. 1987.

The revised areas are screened for easy reference.Only changed index, schematic and theory of opera­tion pages are included in this supplement. All thepages in this supplement are update or change pagesto the early production manual. The manual's introduc­tory cells 2 through 5 also apply to this supplement

An understanding of the material contained hereinand in monthly issues of Dealer Technical and Man­agement Bulletins. issued when necessary, will assistservice personnel in properly maintaining the qualityto which Chevrolet cars are built.

All information. illustrations and specifications con­tained in this Manual are based on the latesi productInformation available at the time of publication approval. The right is reserved to make changes at an'{time without notice

NOTICE: The 1988 Chevrolet contains many partsdimensioned in the metric system. It isimportant to note that. during any maintenanceprocedure. replacement fasteners must have thesame measurements and strength as those re­moved whether metric or customary. (Numberson the heads of metric bolts and on surfaces ofmetric nuts indicate their strength. Customarybolts use radial Hnes for this purpose, whilemost customary nuts do not have strengthmarkings.) Mismatched or incorrect fastenerscan result in car damage or malfunction, or pos­sibly personal injury. Therefore, fasteners re­moved from the car should be saved for re-usein the same locations whenever possible. Wherethe fasteners are not satisfactory for re-use. careshould be taken to select a replacement thatmatches the original.

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Update Change SummaryThe Update Change Summary describes the

revisions, the category of revision, the cell andpage number, and the zone where the revisioncan be located on the schematic. The schematicis seperated into six zones to easily and consis­tently locate information within Section 8A.Figure 1 below shows the zone locations. It isrecommended that you transfer the minorchange information in the Update Change Sum­mary to your 1988 Chassis Service Manuals.

Index Page

The Late Production and Revised pages areindicated in the index by an asterisk.

late Production and Revised Notes

The Late Production and Revised notes areused throughout the Section 8A Supplement toidentify the type of revision. Late Productionrepresents revisions that occurred throughoutthe model year. This indicates cars were built asshown by the Late Production revision, as wellas the schematic in the respective 1988 ServiceManual.

Revised notes represent revisions thatoccurred throughout the model year as well;however, the cars were built only the way therevised schematic represents. Note, a Revisedschematic supersedes the respective page in the1988 Service Manual.

INTRODUCTION

Figure 1 - Zone lOCitions

INDEX

Air ConditioningAir Delivery

Electronic IC68! ..Manual IC601. . . .

Blower ComrolsElectronic IC68!.ManuallC60) .

Compressor ControlsElectronic iC6Bi.Manual (C601 .

System CheckTemperature C'1nlrtlb

i,:lec"ronic IC(;I"Alarms (Audiblel

Chime ..Antenna (power! ..Brakes

Antilock Brake SystemWarning System

Charging System .Cigar Lighter. ....Circuit Breaker Details

Defogger Circuit Breaker.PWR ACC Circuit BreakerPWR WDO Circuit Breaker.RR Hatch Circuit Breaker.

Component Location Views .Connectors

Harness Connector Faces .C100 Details . . . . . . . . . . . . . . . . . ..Body (C209) Details .

Convertible Roof. ..........•......Coolant Fan .Cruise Control. .Defogger (Rear)

Electronic Air Conditioning.

Manual Air Conditioning ..Displays

Digital Cluster.Coolant TemperatureFuel.Oil Pressure .Speedometer.

Door Locks (POWH).

Engine ControlMulti-Port Fuel Injection

IV8VIN 8) .Fuse Block DetailsFuse Details

Page

68-0*65-0

66-063-0

67-064-062-0

75·lJ151-0*

44-(H

41·030-1

! 14-3

11-811-7

11-711-2

201-0*

202-0202-0202·0121-031-0*34-0*

61-1

61-0*

82-0*82-1 *82-1*82-1 *82·0*

130-0*

20-0*11-0

AIC Fuse ..Brake Fuse ..C. Fan Fuse.CLSTR Fuse.Cruise Fuse ..CTSY/CLK Fuse.ECM IGN FuseFP Fuse.Gages FU5e.INJ 1 FuseIN,J 2 FuseINST FuseLCD Fuse ..Radio FuseSTOP:HAZ Fuse.Tail Fuse.Turn/BU Fuse.VATS Fuse .."':PR Fuse

Ground Distribution ..Harness Routing Views ..Hatch Release.Horns.Indicators

Antiiock.Brake. . .Charge .Door AjarFasten SeatbeltHatch Ajar .HI Beam ..LH Turn .Low Coolant .RH Turn .Security. . . . .Service Engine Soon .

Instrument PanelDigital Cluster.

Interior Lights Dimming.Introduction.Lights (Exteriorl

Back Up .Cornering.FogFront MarkerHazard.Headlights .

Page

11-411-2

11-611-711-6

11-311-4l1-")

!l-611- 711-511-511-2

jj-4

11-:~

14-0*203-0134-0

40-0

82-~

82-282-382-282-382-282-0*82-0*82-3

82-0*82-382-2

82-0*117-0

2-0

il2-0

100-1*110-0*110-0*100-0*

Doors _ .LicensePark ....Rear Marker.Stop ..Tail...Turn.

LIghts (lnteriorlCargo

Convertible .Coupe. . .

Caurtes'·ConvertibleCoupe ..

EngmcC;!ove BoxHeader _\lapConver~ib:t·

('.:lUPE:

:-lapCom'ertihle .Coupe

Spare TirpConvertibleCoupe.

Vanity MirrorConvertible .Coupe.

Light Switch Details ....Low Tire Pressure Warning System ..Mirrors (Power).

Heated .Electronic Air Conditioning.Manual Air Conditioning.

Power Distribution.Radio. . . .

Delco-Bose"ConvertibleCoupe.

Repair ProceduresSeats (Power\

Lumbar Support.6 Way

Starter ..

Page

102-0110-5110-0*110-5110-0*110·51l0-0*

114-1ll4-0

114·\

114-0

11·1-3

114·:3

114-1

I!H)

114·J114·f)

114-1

I J4-0

114-1114-0

12-048-0

141·061-061-161-010-0*

150-0

150-3150-2

5-0

145-0140-0*30-0

Theft Deterren tForced Entry Alarm SystemVATSVehicle Speed Sensor.

Warnings !Audiblel. .Windows (Power)Wiper Washpr

With Pul5e ..

133-0*133-11.33-0-5·0

120·fl*

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Late Production

Late ProductionA

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8A-82-1

8A-S2-G

8A-68-0

8A-61-0

8A-34-~

8A-31-2

8A-44-10--~-_·_------·~-----l~

, 3- _

I i L~ I Change the Overdrive Relay location from RH front of dash, ri~ht of bra-~-l[ 8A-20-10 I 0, F Late Production I master cylinder page 20 1-3-B to in engine compartment. on rear of LHIiishock tower page 201-2-A"

i---- I - ;-----.-------------.--I· ! Change the Auxiliary Coolant Fan Relay location from LH rear corner of i

engine compartment page 201-11-B to front of engine compartment. on .LH rear of radiator should page 201-11 -B *Change the Coolant Fan Relay location from LH front of dash. belowbrake master cylinder page 201-2-A to in engine compartmem. on rear of

LH shock tower page 201-2-A' ,-------------------------, ...--- .----- ------.----.---.--.----..-----,------~--.----,-.----- ..---------- -~"-i

The LT GRf\l (402) wire between connector ClOO. terminal Co and the iInstrument Cluster. temrinal 09. is changed to l T GRN/BLK (402, I

----------,- - ----------------------------1

Revised . In F: Wheel Speed Sensor Test change all 900 ohms to 1100 Orlll!S. tr------ r------------------- -- --------j

The PPL (192) wire between connector C211, terminal C and the RH !HATCH STRUT is changed to BLK/REO 1192; I------------ --------------------------------------- ------------- -----------------1

The BLK (154) wires between connector C10G, terminal F7 and the iB __ Late Production __ Heater and A/C Controi Assembly, terminals 012 and 013 are changed i

i : ! to BLK/WHT (154l, + i c---- ------------------- -------------------- -- ----------

: ~ ; L - P d '_ ; The .35 OK GRN (734) wire between connector C210. termllla! G and, U i ate ro uCtlO" I -- ., I c the In-Car Sensor IS changed to.5 OK GRN (734) i----- _---+ --j- c --------------i

E . Late Production I The.5 LT GRN (11), .5 LT BLU (14) and .5 OK BLU (15) wims at c

! i I terminals C3, C2, and C4 of the Instrument Cluster are ail changed to .8

I i ~e wires. -- -1i A i Late Production I The LT GRN (402) wire at terminal D9 of the Instrument Cluster is !II, II i changed to LT GRN/BLK (402) ~

• For details on how to use this cell, refer to Contents page.

I Page I Zone Rev;';on Categmv Rev,,;on =1Change the Auxiliary Coolant Fan Relay location from LH rear corner ofengine compartment page 201-11 -B to Front of engine compartment, on

I 8A 10 2 C E L P d· I LHrearofradiatorshroudpge201-11-B*

- - , ate ro uctlOn ., Change the Coolant Fan Relay location from LH front of dash, below

Ii . brake master cylinder page 201-2-A to in engine compartment, on rea"~O~f

LH shock tower page 20 1-2-A*

8A 14 2 C 0 L P d· The BLK (150) wires for the LH and RH Fog Lights are removed. Fog ,

- - , ate ro uctlOn L' h d d h h h RH H dl' h 'I ~g ts are no~ groun e t roug t e ea Ig t. , --.---JI 8A-20-5 E R . d I' First Gear SWitch should be shown normally closed, Note IS to read:,II eVlse OPEN IN FIRST GEAR.

UPDATE CHANGE SUMMARY

• For details on how to use this cell. refer to Contents page.,~------------------'-' '---"'----_._--, .L------Page i Zone ! Re_~ision ~ategory --l R~vision ._~__:-_;_------- . , ---J

I AiL Pd' I Tne.5LTBLU(14)wlreoetweenconnectorC100,termmaIG4andthe, ate rouction :. ,

: i • Instrument Cluster IS chanQed to .8 l T BlU (14) ISA-1 10-1 1---------~---------~-,.--. ~----~-------~--~ --.---------------------,

, E 'L· Pd' : The.5iJKBLU'15Iwirebetw.eenconnectorCl00,terminaiG8andtheatp. . ro uctlon . CI·· , 8 DK BlU (15):r:strument uster IS cnanged to . .

8A-114-0 8 Late Production The .35 RED (9561 wire between spiice 5402 and the Diode Module ischange to.5 TED (956)The .35 WHT (156) between spiice 5415 and the Diode Module; and the35 WHT 1156} between splice 8415 and connector C209 are change to5 WHT (156).

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