is this a bad CDM or what???
Thread Starter
Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
is this a bad CDM or what???
Ok, plugged cdm in and used two head units to see if either would work and they both did the same things.
all lights work
turn volume **** on and nothing is displayed in the area where a radio station would be.
press the volume **** and the clock would illuminate breifly.
I have no speakers hooked up at this point, just wanted to see if the system would work at least. The guy I purchased this cdm from said it worked fine in his car. Ive checked the radio fuse on mine and it isn't blown. I haven't check for power at the fuse though. My atenna is damaged so can't tell if its working by that.
was there ever a ground wire from the dash to the head unit in these cars? or could it simply be not working because my speakers and amps are not hooked up. I would have thought the head unit would work even if these speakers were disconnected.
also when trying to put a c/d in it can be pushed in but doesn't pull it in electrically like other c/d players I've had.
this is on a 90 btw
all lights work
turn volume **** on and nothing is displayed in the area where a radio station would be.
press the volume **** and the clock would illuminate breifly.
I have no speakers hooked up at this point, just wanted to see if the system would work at least. The guy I purchased this cdm from said it worked fine in his car. Ive checked the radio fuse on mine and it isn't blown. I haven't check for power at the fuse though. My atenna is damaged so can't tell if its working by that.
was there ever a ground wire from the dash to the head unit in these cars? or could it simply be not working because my speakers and amps are not hooked up. I would have thought the head unit would work even if these speakers were disconnected.
also when trying to put a c/d in it can be pushed in but doesn't pull it in electrically like other c/d players I've had.
this is on a 90 btw
Last edited by jeffp1167; Aug 24, 2009 at 12:53 AM.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Ok, plugged cdm in and used two head units to see if either would work and they both did the same things.
all lights work
turn volume **** on and nothing is displayed in the area where a radio station would be.
press the volume **** and the clock would illuminate breifly.
I have no speakers hooked up at this point, just wanted to see if the system would work at least. The guy I purchased this cdm from said it worked fine in his car. Ive checked the radio fuse on mine and it isn't blown. I haven't check for power at the fuse though. My atenna is damaged so can't tell if its working by that.
was there ever a ground wire from the dash to the head unit in these cars? or could it simply be not working because my speakers and amps are not hooked up. I would have thought the head unit would work even if these speakers were disconnected.
also when trying to put a c/d in it can be pushed in but doesn't pull it in electrically like other c/d players I've had.
this is on a 90 btw
all lights work
turn volume **** on and nothing is displayed in the area where a radio station would be.
press the volume **** and the clock would illuminate breifly.
I have no speakers hooked up at this point, just wanted to see if the system would work at least. The guy I purchased this cdm from said it worked fine in his car. Ive checked the radio fuse on mine and it isn't blown. I haven't check for power at the fuse though. My atenna is damaged so can't tell if its working by that.
was there ever a ground wire from the dash to the head unit in these cars? or could it simply be not working because my speakers and amps are not hooked up. I would have thought the head unit would work even if these speakers were disconnected.
also when trying to put a c/d in it can be pushed in but doesn't pull it in electrically like other c/d players I've had.
this is on a 90 btw
Having said that, I might be getting my years confused but I could of swore that on at least some years of the C4 the radio could be "locked" and it needed a code. My appologies if this is not the case.
Thread Starter
Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
on the front of the 1990 head unit it does say delco loc II .... is this something like later model theftloc? the 93 radio doesn't say this and a new faceplate I bought doesn't say this either ... If it is loc'ed how do you unlock these? I dont have a manual for it.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
). The code was part of the documentation that came with the car....that had that radio. As I recall, the only way to unlock it without the code was to take it to a dealer and they need the VIN of the car it came out of.
Thread Starter
Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
Yep, that's what I recall (I used to have a '90 but it's been 13 years ). The code was part of the documentation that came with the car....that had that radio. As I recall, the only way to unlock it without the code was to take it to a dealer and they need the VIN of the car it came out of.
). The code was part of the documentation that came with the car....that had that radio. As I recall, the only way to unlock it without the code was to take it to a dealer and they need the VIN of the car it came out of.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Thread Starter
Safety Car
Joined: Oct 2008
Posts: 4,689
Likes: 4
From: Yucaipa CA
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,009
From: Texas
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
