Error Code P1670 QDM questions - Page 7 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-31-2010, 06:00 PM   #61
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Unplug the AC and see what happens.
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Old 01-31-2010, 06:15 PM   #62
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Okay, a/c off car up to temp. Fan relays pulled out. Fuse blows. So the short is somewhere between the relays and the fuse. From the wiring diagram it shows from the fuse power goes directly to the relays. Any ideas?
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Old 01-31-2010, 06:31 PM   #63
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Unplug the harness to your transmission and retest.
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Old 01-31-2010, 07:35 PM   #64
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okay I need some help. The 5C circuit where does it feed power to? I know it goes to the relays for the cooling fan but it also goes somewhere else and I am not sure because I have no schematic. all i have is the diagram in this post.

https://www.gmforum.com/showthread.p...an+temperature

I disconnect the transmission harness and take out the relays and the feed from 5C is still grounding out. Anyone have the wiring diagram and can tell me what else 5C feeds? It is grounding out somewhere.
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Old 01-31-2010, 08:09 PM   #65
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So with the fuse out from 5C the feed side is connected to ground. This si the same wire that feeds terminal 85 on the fan relays. That doesn't seem right to me. I am thinking that it is just bare somewhere grounding out. Any thoughts?
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Old 01-31-2010, 08:33 PM   #66
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If the fuse still pops when both relays are out, then you must have a short between either 85'* and P100, which is the grommet on your firewall.
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Old 01-31-2010, 08:53 PM   #67
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Pull the relay for the AC.
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Old 01-31-2010, 08:57 PM   #68
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5C Coolant Fan Relays, Fuel Injection, TCC/Antilock Brake Switch, Automatic Transaxle.

5C feeds
Pin E automatic transaxle
Pin 85 Low speed fan relay
Pin 85 High speed fan relay
Pin A TCC/Antilock brake switch
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Old 01-31-2010, 08:59 PM   #69
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Thanks Bill!
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Old 01-31-2010, 09:06 PM   #70
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Quote:
Originally Posted by BillBoost37 View Post
5C Coolant Fan Relays, Fuel Injection, TCC/Antilock Brake Switch, Automatic Transaxle.

5C feeds
Pin E automatic transaxle
Pin 85 Low speed fan relay
Pin 85 High speed fan relay
Pin A TCC/Antilock brake switch
Hrmm that'* interesting. Where is the antilock brake switch?
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