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Hey guys, I have an 01 c5 corvette that for whatever reason won’t start. I’ve changed the starter, just got a new battery, brand new ignition switch from acdelco. Yet to no avail. One day it was driving normal, no hiccups or issues, then when I went to start it again it didn’t want to work. It’s an auto transmission with stock engine. Every time I try to start it I hear no crank but I hear a buzz, almost like the sound of power lines. If anyone has any insight that’ll be great.
Attached is a video
The buzzing your hear is the fuel pump…comes on and shuts off for 2 seconds…this may be an issue on the ground side of your starting circuit or a bad TDR relay…connect a 12 volt test light to battery negative and touch it to a clean spot on the engine block…while trying to start the car if the test light illuminates it’s a bad block ground…the battery negative ground is above the starter….TDR (Theft Deterrent) relay is above the BCM in the passengers footwell…with the car in N or P make yourself a pair of jumper wires and jump the RED to the PURPLE wires…if the car now cranks you most likely need a new relay.
You should hear the TDR click on when you turn the key to the start position, the sound should be coming from the passenger footwell area, if the TDR does not click on you could have a problem with the Park/Neutral switch.
is there any helpful videos on this? I would like to give it a shot after work today. Or is there a way just to buy a new TDR? Thanks for the help.
Originally Posted by C5 Diag
The buzzing your hear is the fuel pump…comes on and shuts off for 2 seconds…this may be an issue on the ground side of your starting circuit or a bad TDR relay…connect a 12 volt test light to battery negative and touch it to a clean spot on the engine block…while trying to start the car if the test light illuminates it’s a bad block ground…the battery negative ground is above the starter….TDR (Theft Deterrent) relay is above the BCM in the passengers footwell…with the car in N or P make yourself a pair of jumper wires and jump the RED to the PURPLE wires…if the car now cranks you most likely need a new relay.
You can just buy a new TDR at most auto parts store, it's located behind the toe board in the passenger footwell area. The TDR sits on top of the BCM and has four wires, a red,violet, and two yellow wires one which has a black strip.
I got a new TDR and installed yet no engine starting, I can hear the tdr clicking yet nothing? Any ideas ?
Originally Posted by mmartinez
You can just buy a new TDR at most auto parts store, it's located behind the toe board in the passenger footwell area. The TDR sits on top of the BCM and has four wires, a red,violet, and two yellow wires one which has a black strip.
I bought a new TDR relay and installed yet to no avail? Any thoughts on what it could be I’m completely stumped
Originally Posted by C5 Diag
The buzzing your hear is the fuel pump…comes on and shuts off for 2 seconds…this may be an issue on the ground side of your starting circuit or a bad TDR relay…connect a 12 volt test light to battery negative and touch it to a clean spot on the engine block…while trying to start the car if the test light illuminates it’s a bad block ground…the battery negative ground is above the starter….TDR (Theft Deterrent) relay is above the BCM in the passengers footwell…with the car in N or P make yourself a pair of jumper wires and jump the RED to the PURPLE wires…if the car now cranks you most likely need a new relay.
Check fuse 52 it supplies 12v to the red wire on the TDR, if the TDR is clicking on the violet wire should be sending 12v to the starter solenoid, the ultimate test is to place a clip lead to the violet wire on the starter solenoid and ground and verify there is 12v when the key is turned to the start position of the Ignition switch.
1.Measure between a groundpoint and RED lead into relay socjet to verify if TDR get 12 v power.
2.Measure between a groundpoint and PURPLE lead into reaysocket to verify if TDR give 12volt power too the starter when you turn KEY to start position.
3 IF you measure 12 volt on line 2 above then connect positive lead of your multimeter to starter (3) and verify if the starter get 12 v power,
IF you get 12v on starter (purple lead) your starter solonoid may be defective (if the starter also get 12v from battery also)
01 C5 won’t start!
