If you study the circuit diagram, you'll see that this^ assumption is incorrect. It is possible for the cluster gear lights to work without ECU pin B7 receiving ground through the shift position console switch. If pin B7 can't be grounded, then the ECU would never know that the transmission is in park.
I see what you are talking about. To look at this I took off the safety neutral switch last night and moved it around. It did change the lights on the dash. I had the car in the ON (II). I thought I messed up on putting the new one on. I did go as far as testing B7 again. I had continuity from Green2 going to park (green/white) and neutral (green) [page 23-155]. I'm pretty confident that the ECU knows what's going on with that section. I did how ever see if there was continuity between the green/white wire coming out of the Interlock Control Unit to the green/white wire going to the safety neutral switch. I retested the key interlock system built into the steering wheel last night too [page 23-150]. I'm getting battery voltage in the white/green wire going into the key interlock switch/key interlock solenoid. Then only when the key bottoms out in the switch and you push (it has probably about a mm or 2 give after it bottoms out) I get battery voltage coming out of white/blue and white/yellow going to the interlock control unit. I'm also getting battery voltage at the shift lock solenoid on the yellow and yellow/black wires. Black wire coming out of interlock control unit has continuity to ground. I checked the TPS and it was good with steady voltage drop. I how ever didn't check continuity between the TPS red/blue to ECU. Looking at the interlock control system on page 1243/1258 PDF format, the only thing that is part of the is the safety neutral switch, the key solenoid and the interlock control unit. In that circuit you have four wires that go to the ECU.
- Green/Blue from Drive3 of the safety nutral switch
- Green/Black from Drive4 of the safety neutral switch
- Green coming from ECU to Park and Neutral on the safety neutral switch
- White/Red coming from Interlock Control unit.
I want to test all of these to see if I have continuity. (We have tested some)
I'm looking at page 23-151 and it says NOTE:
If the shift lock solenoid clicks when the ignition switch is ON (II) and the brake pedal is pushed (the shift lever is in P and he accelerator is in its rest position), the shift lock system is electronically normal. If the shift lever cannot be shifted from position P, see page 23-162 and section 14. That's almost exactly what is happening to me. When you put the car in ON (II) you can see the shift lock solenoid jump a bit like it's doing a self test. BUT when you press on the brake pedal either in the ON (II) or while car is running the shift solenoid does not release the gear shifter from park. Page 23-162 is an Integrated Control Unit. Looks like it is plugged into the back of the fuse box. I did see a black box behind the fuse box while doing all this testing but never tested anything with it because I didn't think it was part of the system. Looks like it does a bulb check for the brake lights, seat belt/key reminder beep (which mine doesn't work). I can have the key in the ignition with the car off open the door and I don't hear a ding-ding. I checked that last night and the only time I hear a reminder ding is if I push the key past it's bottoming out point like I did with the key interlock/key solenoid test. Do you think the only reason that the Interlock System mentioned this was because of the bulb check system built into the Integrated Control Unit. I checked all my light bulbs couple days ago and everything seemed fine. I'm going to stop by Advance after work and purchase the rear lights meaning all the lights on page 23-181. I don't think I checked brake/taillight bulb in the trunk lid. If this comes down to a bad light bulb, I might just blow up. lol. What are your thoughts on all of this?
This is what we know that is testing good:
- Key interlock switch/key interlock solenoid
- Shift Lock solenoid
- We know that the white/red wire is connected to the ECU in connector D pin 18 due to a continuity test.
- We know that the there is continuity on the green/white (connected to Park) wire on the safety neutral switch going to the interlock control unit plug.
- The connector going to the Interlock Control unit (all wires) are testing the way they should.
- Throttle Positioning Sensor test 4.5v when fully open and nice steady voltage drop all the way to close with .5v.
- I checked all fuses last night under the dash. All passed continuity test.
