Ground locations
Since Corvettes seem to have issues with grounds, I have compiled a list of the Ground locations and the circuits attached with each ground for reference purposes. I thought others might benefit from this list.
Ground locations From 2003 Corvette Shop Manual engine ground strap top left frame behind left front wheel well G101 left front frame (with SP101) G102 right front frame (with SP100) G103 left front of engine G104 frame next to battery (with G108 & SP102) G105 left lower engine block, engine ground strap & wire G106 Battery negative pole G107 Left rear head G108 frame next to battery (with G104) G201 bottom of A-pillar, left (with SP201 & SP203) G202 bottom of A-pillar, rt, bolted at the bottom (with SP202) G205 inside door pillar driver seat (with G301) G301 inside door pillar passenger seat G302 inside door pillar driver seat (with G205) G401 left rear outer frame G402 right rear inner frame SP201 bottom of A-pillar, left (bolted with G201) SP202 bottom if A-pillar, rt (bolted to G202) SP203 bottom of A-pillar, left (taped to wire bundle, with G201 coming out of it) G101: windshield washer fluid pump Windshield washer fluid level switch Brake fluid switch Headlamp door assembly, left G102: cooling fan, right Cooling fan 3 relay 44 Horn assembly Underhood lamp Headlamp door assembly, right Headlamp door control module A/c compressor clutch A/c compressor clutch diode Secondary air injection pump G103: Electronic brake control module (ebcm) G104: battery negative pole Splice pack SP102: Marker lamp, right front Marker lamp, left front Park/turn signal lamp, right front Park/turn signal lamp, left front Turn signal lamp, right front Turn signal lamp, left front Splice pack SP208: Body control module (bcm) Instrument panel cluster (ipc) Data link connector (dlc) Inflatable restraint & diagnosis module Inflatable restraint ip module disable switch Park/neutral switch Remote control door lock receiver G105: fuel pump relay 35 Engine oil level switch Heater O2 sensor, bank 1 sensor 1 Heater O2 sensor, bank 1 sensor 2 Heater O2 sensor, bank 2, sensor 1 Heater O2 sensor, bank 2, sensor 2 G106: battery negative pole Ignition relay 42 Powertrain control modules (pcm, 4 wires) Throttle actuator control module (tac) Mass airflow sensor (maf) G107: ignition control modules 1-3-5-7 Ignition control modules 2-4-6-8 G108: Electronic brake control module (ebcm) G201: Splice pack SP201: Data link connector (dlc) Air temperature actuator Instrument panel cluster (ipc) Traction/suspension control switch Driver door module (ddm) Door latch, driver Auxiliary power outlet Windshield wiper motor Steering column lock Footwell courtesy lamp, left Instrument panel cluster (ipc) Hazard switch Telescopic actuator switch Splice pack SP203: Remote CD changer Fuse block I/P Speaker, right door Speaker, left door Radio G202: Splice pack SP202: Passenger door module (pdm) Door latch, passenger side Body control module (bcm) HVAC control module IP compartment lamp Footwell courtesy lamp, right Vanity mirror lamp, left Vanity mirror lamp, right Inside rearview mirror Bose relay 45 Ignition switch Blower motor relay c60 Blower motor control processor Hood ajar switch Cigar lighter A/t shift lock control solenoid G205: seat belt switch, driver Seat control module (scm), driver Seat pump, driver Seat belt switch, driver Seat relay center, driver G301: defogger grid G302: Splice pack SP302: Seat relay center, passenger Seat pump, passenger Rear compartment courtesy lamp, right Rear compartment courtesy lamp, left Rear compartment lid latch Rear compartment lid latch, right Rear compartment lid latch, left Folding top lid latch Folding top release switch Fuel door lock actuator Radio power antenna G401: Splice pack SP400: Fuel pump & sender assembly, left Fuel level sender, right Tail, stop, turn signal, rear left Tail, stop, turn signal, rear right Center high mounted stop lamp Backup lamp, right Backup lamp, left License lamp, right rear License lamp, left rear Marker lamp, left rear Marker lamp, right rear G402 electronic suspension control module (esc) |
Excellant info. I was going to look this stuff up when I got home but this makes it easier. Thanks.
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You are welcome.
Actually, the shop manual does not list this info in a convenient manner. The info is spread out over many pages of circuit diagrams. |
Originally Posted by tpocock
You are welcome.
Actually, the shop manual does not list this info in a convenient manner. The info is spread out over many pages of circuit diagrams. |
:cool: thanks :cheers:
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Great info. Thanks for sharing.
:flag: |
Could you clarify something for me. In the description on G104 it says battery negative pole. But above that where the locations are it says G106 is at the battery negative pole and G104 is on the frame next to the battery. I was looking for G106 today and couldn't locate it. I was a little confused on where to find it. Thanks
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Thanks for that great compendium. I'm going to print it and place the list in the back of my Helms.
Mark |
Originally Posted by 385-C5
Could you clarify something for me. In the description on G104 it says battery negative pole. But above that where the locations are it says G106 is at the battery negative pole and G104 is on the frame next to the battery. I was looking for G106 today and couldn't locate it. I was a little confused on where to find it. Thanks
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385-C5 -- you are correct, there seems to be an inconsistency in the 2003 repair manual. the illustrations do not agree with the schematics or the descriptions. I checked my 2003 ZO6 and what is in the car also does not agree with the illustrations.
I will run this by C4C5specialist to see if he knows about this. |
Awesome post! I had a problem with my front turn signals and DRL's; which also included flashing dash lights, fog lights coming on when turn signals were on, and no DRL's. I used your info and found the G104 ground was badly corroded. I cleaned and replaced this ground, PROBLEMS FIXED!
You the man! |
Originally Posted by tpocock
385-C5 -- you are correct, there seems to be an inconsistency in the 2003 repair manual. the illustrations do not agree with the schematics or the descriptions. I checked my 2003 ZO6 and what is in the car also does not agree with the illustrations.
I will run this by C4C5specialist to see if he knows about this. |
Great post! Thanks Tpocock!
Can anyonen tell me how to access the ground points located at the bottom of a pillar? I'm having major code issues and need to check these locations. Thanks. |
G201 is at the bottom of the left A pillar.
G202 is at the bottom of the right A pillar. The A pillar is where the door hinges attach. It is behind the plastic floor kick-up panel. |
Great. Thanks again.
Is the floor kick-up panel the one that runs front to back under the door? If so does it just "snap" into place or are there any fasteners? |
No, it is the plastic panel that wraps around the door jam below the door hinges. It should pop off, and the ground point should be bolted to the bottom of the verticle piece of metal that is under this plastic cover.
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Follow-up on G104 and G106.
There apparently have been corrections to the 2003 shop manual. G106 is on the right side of the engine block above the starter. It supplies PCM, TAC, MAF, ignition relay, and neg cable from the battery. G104 supplies parking lamps, BCM, door lock reciever, IPC, air bag switch and module, DLC, and the engine compartment fuse box. There are 3 wires connected to G104 which on the top of the right front frame just ahead of the battery. |
Thanks I am going to work on it now. Wish me luck.
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LOL I decided to clean up my rusted G104 the other day and snapped the earthing bolt. What a great post t was that started this thread. Thank you tpocock
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tpocock thank you for the list... I hope I never need it!
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