Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello, my name is ***** ***** I'll be happy to assist you today. I have an associates degree in automotive technology, ASE certified with 15 years in the field. I'm sorry to hear your having trouble finding the relay. I'm going to see if I can find a decent picture for you and will be back ASAP.
OK no problem. It's hard to be available at all times as I am a private contractor but I promise I will respond further as soon as I see your response.
I'm very sorry I didn't opt out sooner for you! I did check some old shop manuals at my shop and they are all showing what we already know. (the wrong location). I will OPT out now and if i come up with anything different I will still try to help! Hopefully one of gets this resolved for you.
IF this is a 1998 Cheyenne & this has Factory Power Door Locks, you likely do NOT have a Door Lock Relay.......The circuit would be "Reversal Rest At Ground"IF there is Voltage + on the ORANGE wire at the Driver & Passenger SwitchPressing LOCK should show Voltage + out of the Switch on the LIGHT BLUE wire (driver switch) & GRAY wire (passenger switch)Does it??
As posted the Circuit is "Reversal Rest at Ground"Meaning:When Lock is pushed the LIGHT BLUE wire (driver switch) & GRAY wire (passenger switch) will have Voltage +The WHITE wire on Driver & Passenger Switch will have Ground -Or the TAN wire at the Door Lock Motor will have Ground -.
When UNLOCK is pushed, the LIGHT BLUE wire (driver switch) & GRAY wire (passenger switch) will have Ground -The WHITE wire on Driver & Passenger Switch will have Voltage +
Or the TAN wire at the Door Lock Motor will have Voltage +
This is how the Voltage + & Ground - works the Door Lock Motors, by "reversing" the Voltage + & Ground -Be sure you have a good Ground - on the BLACK wire of the Driver SwitchHere is SchematicClick Attachment Below
The Ground "G202" BLACK wire is to the Left of the PCM at rear of dash on Firewall inside
thanks, ***** ***** on for apprx 1 more hour, then on tomorrow
But the ORANGE wire has at least 11.5 volts DC?
Doors UNLOCKED:With Passenger Lock pressed ...what happens if you BRIEFLY "jumper" a Ground - wire to the TAN wire of the Passenger Switch?
IF you were to Unplug both switches & jumper the GRAY wire at the Passenger Switch with Voltage + & Jumper the TAN wire with Ground-, the Door Lock Motors should respond
are there letters on the plugs that correspond to the wire colors..........
thanks..............I may have wasted your time.........When you have "both plugs connected"......Press Lock or Unlock, do you here any "clicking" under the dash, as that is a Plug for the Relay version.The "click" will be faint, if at all
the problem with this year is there were 3 typesThe Circuit I providedThe circuit for the Relay under Driver DashThe circuit for 2 Relays in the Fuse PanelThe Reversal Rest At Ground, as I posted is still correct for the circuit I posted & the Relay under the DashThe BROWN wire is for Park Lamp feed for the Lighted Switches.
I saw the picture you posted under the dash & I have seen the Relay mounted above the Steering Column area. Not where it typically is.At this point, after seeing the Plug you have, with the Door Switches in "neutral" position, the ORANGE wire is Voltage +, WHITE wire is Ground -, the LIGHT BLUE is Ground -, the TAN wire is Ground -, the BROWN wire is Park Lamp feed +, but I show nothing for the DARK BLUE, which I assume is Ground -You may want to see what wires come from the Door Lock Motors to the Switch.Unplug both switchesThen test each Door Lock Motor by jumpering the 2 wires from each Door Lock Motor at the Switch Plug to see if the Door Lock Motor respondsThen reverse the Jumpers to see if the Door Lock Motors respond the opposite wayI have GM Service Manual & cannot see the 2 DARK BLUE wires goung to either plugWill have to research in morning, but I am truly sorry for the issue..........
Will post backthanks
I have the V.I.N. & will need to have a look on which circuit it is........I still believe it is a non relay / Reversal Rest At Ground type, but the GM diagrams I have here are not showing the complete circuit......Typical for those years.........Will try to get the diagrams first thing
are you sure the picture of the Plug you posted is for the Door Locks?
yes .....I understand.........thanks
ok.......will post back as soon as I get the correct diagrams
will have to pass on this, as GM only has those same diagrams as posted........at this point, I would trace harness from driver door, into dash & trace across dash to passenger doorIF there is NO Relay branching off at the point the diagram shows, then it could have been moved or someone has rewiredBeing Internet, this is very difficult without being "hands on".........Will OPT OUT & RELIST
Please do not respond to this, as it will Lock Question
Hi, My Name is ***** ***** for posting your question to just answer. I am a independent contractor for just answer. ASE Certified Master Auto Technician with 20 years experience. I am confident we can resolve your problem together.Please remember I don't know your skill level. I can't see, smell, hear, or touch the vehicle. It may take a few back and forth replies to get to a satisfactory resolution.There will probably be some equipment needed for a proper diagnosis. If you are not comfortable with this or do not have any test equipment please let me know ASAP. I also give you all of the information you may need in good faith expecting a positive rating. I am not compensated for my time until you leave a positive rating. Your rating should be based on the service you received.
Do you still need help? Do you have a test light instead of the meter?
the relay you pulled is a lamp control relay
OK. It could be the relay. Lets start back at the door. Where the door opens there is a black tube. If you push it into either the door or the cab you can inspect the wires, I strongly suspect you have broken wires in there. Sometimes it is easier to disconnect inside cab and pull wires into door.
Update: so I checked and the grey wire and tan wire that connect to the motors are not grounded. anyone know where this wires are grounded to?
I am sorry no one has responded, but this question has a lot of issuesI posted earlier that this is a "Reversal Rest At Ground Circuit"Meaning:There are "TWO" wires at the Door Lock Actuator / MotorWhen the Switch is pressed to LOCK:One wire will have Voltage +One wire will have Ground-Then, when the Switch is pressed to UNLOCK:The wire that had Voltage + should now have Ground -The wire that had Ground - now should have Voltage +So to answer your last "Update",At the Door Lock Actuator / Motor:IF the Gray wire has Voltage + & the TAN wire has Ground -Then the Actuator should move one way or the otherThen if you switch the wires, the Door Lock Actuator / Motor should move the other wayIF it does NOT, replace the ActuatorI cannot continue with this, as you have not followed thru with my suggestions & hands on cannot be done
I checked my other truck to see how the voltages and grounds work. when nothing is being pressed on my other truck both the grey and tan wires have ground going to them.
That is correct, as I explained a few days ago...Circuit is "Reversal "Rest at Ground"
I believe there is a Relay somewhere in the truckmay not be where it is supposed to be, but by the way you have described it in all your posts, which I have read a number of times, this appears to be Relay driven
I would trace harness from driver door, into dash & trace across dash to passenger door
IF there is NO Relay branching off at the point the diagram shows, then it could have been moved or someone has rewired
Hi and thank you for the question, I'm sorry you are having this issue. I'll do my best to help you ok. Let me look up the schematics and I'll be right back with you...