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Ignition switch relay

Tiny
L B DANIEL
  • MEMBER
  • 2003 CADILLAC CTS
  • 3.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
Where is the ignition switch relay on the 2003 Cadillac CTS?
Monday, March 14th, 2016 AT 2:52 PM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It's in the under hood fuse block. It should have a diagram on underside cover of fuse block.
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Monday, March 14th, 2016 AT 4:04 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hi here is a diagram of your PDC

Please let us know what you find
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Monday, March 14th, 2016 AT 5:06 PM
Tiny
L B DANIEL
  • MEMBER
  • 3 POSTS
Does anyone have a wiring diagram for the 2003 Cadillac CTS ignition?
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Wednesday, March 16th, 2016 AT 11:35 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Before we send a diagram what exactly is wrong with your car? Won't start? Try security reset first. Or tell us what problem you are experiencing.
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Wednesday, March 16th, 2016 AT 12:20 PM
Tiny
L B DANIEL
  • MEMBER
  • 3 POSTS
Security test done 30 minute learned done starter, starter relay checked switch, checked no start, no crank, but security light goes out. I notice the switch is hot which leads to a negative ground or broken wire.
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Wednesday, March 16th, 2016 AT 12:29 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It might be a bad switch too as they go bad. What I'm sending is what we have which is part of engine performance yellow wire is crank and pink is to coils. It could also be a bad connection in fuse box under the hood.
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Wednesday, March 16th, 2016 AT 1:33 PM

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