- Location
- Rainy side of Washington
I was looking through my fsm just now and found some info I've seen multiple requests for... Decided to post it in case anyone needs it again, along with answers to some very common cruise control questions. This all pertains to 95 and later vehicles.
CLOCKSPRING STUFF, 95-96 -
* if you have cruise control, never rotate steering shaft with steering wheel or steering box disconnected, and if you do, you must recenter clockspring before reassembling vehicle.
* non-cruise clocksprings for these years do not need to be recentered. Spin em all you want.
CLOCKSPRING STUFF, 97-up -
* never rotate steering shaft with steering wheel or steering box disconnected, and if you do, you must recenter clockspring before reassembling vehicle.
The cruise switches in the steering wheel are "resistively multiplexed". Basically this means that all the buttons use the same two wires to the ECU, which pass through the clockspring. The ECU measures the resistance between the two wires and figures out which button is pressed. 95-96 is actually a 3 wire system, I am not sure why the third wire is used as it doesn't seem to add any info really. EDIT 2023: it is because the 806 ohm resistor is just in series with the LED on the panel. It has no switch connected to it.
95 uses a switch panel that works like 91-94 ones, but fits in the 95-96 steering wheel. No resistive multiplexing. 'nuff said here.
Resistances for each button, 96 (pin 1 is at left with connector latch at bottom looking at back of switch):
LED and series resistor: 806 ohms (tolerance 8 ohms) from pin 1 to pin 2
Cruise on switch depressed: 909 ohms (tolerance 9 ohms) from pin 2 to pin 3
Resume/accel switch depressed: 15400 ohms (tolerance 154 ohms) from pin 2 to pin 3
Set/coast switch depressed: 6650 ohms (tolerance 66 ohms) from pin 2 to pin 3
Resistances for each button, 97-98:
No switches depressed: open circuit
Cruise on switch depressed: 909 ohms (tolerance 9 ohms)
Resume/accel switch depressed: 15400 ohms (tolerance 154 ohms)
Set switch depressed:
6650 ohms (tolerance 66 ohms)
Coast switch depressed: 2940 ohms (tolerance 29 ohms)
Cancel switch depressed: 0 ohms (short circuit)
I do not have a 99 FSM. If someone with a 99 or later FSM has a minute, mind posting the same numbers from it? They are in section 8h, vehicle speed control system.
EDIT 2024 (how the hell have I been on this forum for 15 years now? Time flies)
Resistances for each button, 99-01:
20500 ohms (no buttons pressed)
8794 ohms (Resume/Accelerate pressed)
4330 ohms (Set pressed)
2571 ohms (Coast pressed)
1169 ohms (Cancel pressed)
454 ohms (On/Off pressed)
Tolerances are on the order of 1%, so for example up to 205 ohms off from 20500 with no buttons pressed. That was 20 years ago at manufacture time though so be a little more understanding, if it is 2 or 5 percent off it will probably still work just fine.
The 99-01 numbers presented above are guaranteed to be correct. I literally measured them myself, then opened the switch panels up, measured each individual resistor internally used in combination to create the resistances above, read the color codes, then did the math to determine what the theoretical combination resistance should be and compared it to my readings. I was less than 0.5% off in every case. The theoretical values are presented above, as that is what the factory service manual presented for the 96 and 97-98 values as well.
Notice that from 96 to 97-98, the only differences are that the redundant second circuit was eliminated, the cruise feature was split from the set feature and given its own resistance value, and the cancel switch was added as well. The other resistances are the same.
97-98 to 99-01, resistances changed. I'm not sure why chrysler did this, make your own conclusions. What I do know is that 97-98 cruise switch panels have an identical part number to 99-01 ones EXCEPT for the alphabetical revision code at the end. If your switches have a revision code of AA, AB, or AC they are 97-98 switches while 99-01 switches have revision codes of AD or later.
CLOCKSPRING STUFF, 95-96 -
* if you have cruise control, never rotate steering shaft with steering wheel or steering box disconnected, and if you do, you must recenter clockspring before reassembling vehicle.
* non-cruise clocksprings for these years do not need to be recentered. Spin em all you want.
CLOCKSPRING STUFF, 97-up -
* never rotate steering shaft with steering wheel or steering box disconnected, and if you do, you must recenter clockspring before reassembling vehicle.
The cruise switches in the steering wheel are "resistively multiplexed". Basically this means that all the buttons use the same two wires to the ECU, which pass through the clockspring. The ECU measures the resistance between the two wires and figures out which button is pressed. 95-96 is actually a 3 wire system, I am not sure why the third wire is used as it doesn't seem to add any info really. EDIT 2023: it is because the 806 ohm resistor is just in series with the LED on the panel. It has no switch connected to it.
95 uses a switch panel that works like 91-94 ones, but fits in the 95-96 steering wheel. No resistive multiplexing. 'nuff said here.
Resistances for each button, 96 (pin 1 is at left with connector latch at bottom looking at back of switch):
LED and series resistor: 806 ohms (tolerance 8 ohms) from pin 1 to pin 2
Cruise on switch depressed: 909 ohms (tolerance 9 ohms) from pin 2 to pin 3
Resume/accel switch depressed: 15400 ohms (tolerance 154 ohms) from pin 2 to pin 3
Set/coast switch depressed: 6650 ohms (tolerance 66 ohms) from pin 2 to pin 3
Resistances for each button, 97-98:
No switches depressed: open circuit
Cruise on switch depressed: 909 ohms (tolerance 9 ohms)
Resume/accel switch depressed: 15400 ohms (tolerance 154 ohms)
Set switch depressed:
6650 ohms (tolerance 66 ohms)
Coast switch depressed: 2940 ohms (tolerance 29 ohms)
Cancel switch depressed: 0 ohms (short circuit)
I do not have a 99 FSM. If someone with a 99 or later FSM has a minute, mind posting the same numbers from it? They are in section 8h, vehicle speed control system.
EDIT 2024 (how the hell have I been on this forum for 15 years now? Time flies)
Resistances for each button, 99-01:
20500 ohms (no buttons pressed)
8794 ohms (Resume/Accelerate pressed)
4330 ohms (Set pressed)
2571 ohms (Coast pressed)
1169 ohms (Cancel pressed)
454 ohms (On/Off pressed)
Tolerances are on the order of 1%, so for example up to 205 ohms off from 20500 with no buttons pressed. That was 20 years ago at manufacture time though so be a little more understanding, if it is 2 or 5 percent off it will probably still work just fine.
The 99-01 numbers presented above are guaranteed to be correct. I literally measured them myself, then opened the switch panels up, measured each individual resistor internally used in combination to create the resistances above, read the color codes, then did the math to determine what the theoretical combination resistance should be and compared it to my readings. I was less than 0.5% off in every case. The theoretical values are presented above, as that is what the factory service manual presented for the 96 and 97-98 values as well.
Notice that from 96 to 97-98, the only differences are that the redundant second circuit was eliminated, the cruise feature was split from the set feature and given its own resistance value, and the cancel switch was added as well. The other resistances are the same.
97-98 to 99-01, resistances changed. I'm not sure why chrysler did this, make your own conclusions. What I do know is that 97-98 cruise switch panels have an identical part number to 99-01 ones EXCEPT for the alphabetical revision code at the end. If your switches have a revision code of AA, AB, or AC they are 97-98 switches while 99-01 switches have revision codes of AD or later.
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