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Randall C
Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 11113
Experience:  ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
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2003 chevy impala: it wont start..starter relay..ck..jumping

Resolved Question:

I have a 2003 chevy impala, it won't start sometimes. all indications are it's the neutral safety switch. Battery good, starter and starter relay ck out by jumping them. Where is the switch located and does it have a history of failing in this model vehicle. Thanks Mike
Submitted: 4 years ago.
Category: Chevy
Expert:  Randall C replied 4 years ago.
Hello, what engine size do you have and do you havea testlight or meter?
Customer: replied 4 years ago.
It's a 3.4 liter
Expert:  Randall C replied 4 years ago.
do you have a testlight or meter?
Customer: replied 4 years ago.
Yes, I know how to test it, I just need to know where it is on that model car. thank you Mike
Expert:  Randall C replied 4 years ago.
I am going to pull the diagram. The starter relay is controlled by the PCM. the ignition switch feeds the pcm then the pcm grounds the relay. I am going to have you check some power and ground points. You will have to do some probing at the PVm as well. yes, this will include the feed test from switch. back to you shortly. I just was confirming you had a meter to test with.

Now if you want just the location of the swtich, I will send that momentarily

Expert:  Randall C replied 4 years ago.
Here is the info on the igniton switch location. Wiring diagram as well

Ignition Switch Replacement

Removal Procedure




  1. Disconnect the battery ground cable.
  2. Remove the steering column filler panel.
  3. Remove the knee bolster bracket.
  4. Remove the instrument panel (I/P) cluster trim plate.
  5. Remove the ignition switch bolts.
  6. Lower the ignition switch away from the instrument carrier.
  7. Insert the key into the ignition lock cylinder. Turn the key to the ON/RUN position.
  8. Depress the retainer to release the transaxle park/lock cable. Remove the park/lock cable from the ignition switch by pulling on the cable. Important: You cannot remove the Passlock(TM) electrical connector until the lock cylinder is removed.
  9. Depress and hold the detent on the bottom of the ignition switch in order to release the ignition lock cylinder. Remove the ignition lock cylinder with the key.



  1. Disconnect the Passlock(TM) electrical connector.
  2. Disconnect the electrical connectors.



  1. Use the following procedure if the ignition switch lock cylinder is seized or won't rotate:
  1. Protect the immediate work area with suitable material such as clean shop towels or a clean fender cover.
  2. Locate the surface for the release button (2) for the ignition switch lock cylinder on the plastic ignition switch housing. Center punch a location (1) on the rib approximately 3/8 inch reward, toward the key entry end, from the cylinder release button.
  3. Carefully drill a pilot hole through the plastic housing with a 1/8-inch drill bit.
  4. Using a 9/32-inch drill bit, carefully drill a larger hole at the pilot location, and slightly into the surface of the ignition switch lock cylinder, to break the release button retaining spring.
  5. Remove portions of the broken spring from the hole using a small suitable tool.
  6. Grasp the ignition switch lock cylinder and remove the cylinder from the switch housing.
  7. Remove any plastic flash from the drilling operation, and using compressed air blow out the ignition switch assembly.
  8. Follow Service Data procedures when cylinder coding is required. Refer to Key and Lock Cylinder Coding.
Installation Procedure



  1. If the lock cylinder would not rotate or was seized, perform the following procedure:
  1. Install the new ignition switch lock cylinder as required by rotating both the cylinder and the ignition switch to the ON position.
  2. Push the ignition switch lock cylinder into the ignition switch housing until fully seated.
  3. You may have to slightly depress the release button as the button passes by the 9/32-in hole previously drilled in the ignition switch housing.



  1. Connect the electrical connectors.
  2. Connect the Passlock(TM) electrical connector.
  3. Connect the park/lock cable to the ignition switch.



  1. Turn the key to the ON/RUN position. Install the ignition lock cylinder into the ignition switch. If you turned the key slightly while removing the lock cylinder, you may have to align the white colored ignition switch rotor (1) with the lock cylinder (2). You can rotate the ignition switch rotor (1) with your finger.
  2. Remove the key.



  1. Position the ignition switch to the instrument carrier. Notice: Refer to Fastener Notice in Service Precautions.
  2. Install the ignition switch bolts. Tighten the bolts to 10 N.m (89 lb in).
  3. Install the trim plate bezel to the I/P cluster.
  4. Install the knee bolster bracket.
  5. Install the steering column filler panel.
  6. Connect the battery ground cable.


graphic

graphic
Expert:  Randall C replied 4 years ago.
Nuetral safety switch info coming next
Expert:  Randall C replied 4 years ago.
Trans mode switch is built into the inside of the trans. I put the diagram below if you need to check any signals form the 20 wire plug at trans and feeds to the PCM. Part inside trans is referred to as the IMS or internal mode switch

graphic
Expert:  Randall C replied 4 years ago.
Trans mode switch is built into the inside of the trans. I put the diagram below if you need to check any signals form the 20 wire plug at trans and feeds to the PCM. Part inside trans is referred to as the IMS or internal mode switch

graphic



Randall C, ASE Master Tech
Category: Chevy
Satisfied Customers: 11113
Experience: ASE Master, L1, 32 years, Diagnostic / Electrical Specialist
Randall C and 11 other Chevy Specialists are ready to help you
Customer: replied 4 years ago.
THANK YOU, XXXXX XXXXX I needed to know. Mike

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