The traction control light and cruise control indicator lights light up upon initial key-turning, so the lamps are good. However when we engage the cruise control or press the trac off button, the indicator lights do not turn on. The cruise control does work, we are not so certain about the traction control. We need this solved somehow as I cannot get my van smog checked until the tech can be certain the traction control is truly off. He did mention using an engine scanner to disengage the traction control, and we have a pocket scanner, but can't seem to figure out how to do that either. Can anyone please help?

How do you know brake pedal positioning sensor needs to be replaced ? Traction light on ? DTC'S - diagnostic trouble code's stored . That's why cruise won't engage . Taking your vehicle to a qualified repair shop an having it diagnosed is what you should do.
Cruise Control Inhibited
The engine control module (ECM) inhibits the cruise control operation when any of the following conditions exist:
• The ECM has not detected a brake pedal activation from the body control module (BCM).
• A Cruise Control System DTC has been set.
• The vehicle speed is less than 40.2 km/h (25 mph).
• The vehicle speed is too high.
• The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.
• The engine RPM is too low.
• The engine RPM is too high.
• The system voltage is not between 9-16 volts.
• The Antilock Brake System (ABS)/Traction Control System (TCS) is active for more than 2 seconds.

Do the stop lamps work ?
DTC P0703 Brake Switch Circuit 2
The body control module (BCM) monitors the brake pedal position sensor. When the brake pedal is applied, the BCM detects a predetermined voltage signal. The BCM sends a GMLAN serial data message to the powertrain control module (PCM) indicating the status of the stop lamps.

DTC P1574 Stop Lamp Switch Circuit
The stop lamp switch signal circuit is a direct hardwire input to the throttle actuator control (TAC) module from the body control module (BCM). The TAC module monitors the stop lamp switch signal circuit in order to detect when the brake pedal has been applied. When the brake pedal is pressed, the BCM sends a GMLAN serial data message to the powertrain control module (PCM) indicating that the brake pedal has been applied. The BCM also sends a high voltage signal on the stop lamp switch signal circuit to the TAC module. The TAC module sends a universal asynchronous receiver transmitter (UART) serial data message to the PCM indicating that a brake pedal application has occurred. The PCM will compare the UART serial data message and the GMLAN serial data message in order to confirm that both serial data messages match.

The fact that the light comes on is a good indication that the electronics are working, the most common problem is a vacumn leak. This can be a damaged or cracked vacumn line, a bad check valve, or the dump switch on the brake pedal

check the adjustment under the clutch and brake pedals If the rubber stops are a bit dodgy then the pedal will not activate/deactivate the controls for the cruise.

This a technical bulletin for your car
Hope this helps, if it does please leave feedback
Good Luck



File In Section: 5 - Brakes
Bulletin No.: 63-50-09
Date: March, 1996
INFORMATION
Subject:
"ETS OFF" Indicator Lamp On with No DTC's Set Models:
1996 Buick Skylark
1996 Chevrolet Cavalier
1996 Oldsmobile Achieva
1996 Pontiac Grand Am, Sunfire On vehicles equipped with Enhanced Traction System (ETS), the "ETS OFF" indicator lamp may come on and ETS and Cruise Control might become disabled. There may be no ABS or PCM Diagnostic Trouble Codes (DTC's) stored and there may be no "Check Engine" lamp on. This condition has caused a high rate of unnecessary IPC replacements.
The PCM sets a Type "C" or "D" FAILURE RECORD which sends a message to the Electronic Brake Control Module (EBCM) to turn the "ETS OFF" indicator on and to disable ETS. The PCM can then disable Cruise Control, but may not turn on a corresponding "Check Engine" lamp. These Type "C" or "D" Failure Records are not stored in the normal Current or History menus.

The technician is instructed to check normal operation of the "ETS OFF" switch and the ETS system. The technician is then instructed to check for Failure Records and directed to Section 6E3-A of the Service Manual, see chart. When the PCM Failure Record is corrected, normal operation of the ETS system and Cruise Control should return.

The fuses for the speed control from the factory are :
Engine Compartment fuse panel #7,
Cab fuse panel Fuses #15, #13, #5

The fuse that goes to the recall part is Fuse #13, 20A

The recall is 05S28. Description: Speed Control Deactivation Switch.
The part number for the recall is : 1L1Z-9F924-AA
The part has a fuse inline that is marked as non serviceable, but 1 revision I saw, it was just an ATM fuse under tape. Not sure if this is the final revision that was used on your truck ( or should have been used ).


The self test for the Cruise Control ( for 00-03 MY, with the CC light on the cluster ) :

With the key off depress and hold the cruise control off button while turning the ignition to the run position,don't start the truck, the cruise light will flash once to let you know it is in self test.
Five additional flashes indicate a bad cruise control servo

Release the cruise off switch and within 5 seconds depress the other switches in sequence:
1. on
2. resume
3. coast
4. set/ accel
The speed control light will flash as each switch is depressed.

If the last one does not flash it may then flash a code

After this the cruise will move the throttle to test the actuator and the cable.
Make sure the throttle returns to idle and turn the key off.
----------------------

Self-Test Diagnostics

WARNING:
This test is a key on engine off (KOEO) test only that is conducted in park only with emergency brake fully engaged.

1. Enter self-test diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.

2. Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.

If the ON switch is not depressed within five seconds after entering the diagnostics mode, the module times out and the procedure must be started over.

The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.

Note:
There will be a slight delay when the last button is pressed and the lamp flashes.

3. A lamp flash with the last button (SET/ACCEL) indicates that the static test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.

If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:

- 2 flashes - BPP defective, circuit is defective, brake applied, CPP switch or jumper (if equipped).

- 3 flashes - deactivator switch is open or circuit defective.

- 4 flashes - vehicle speed signal is out of range or circuit is defective

4. Immediately (.25 second delay) after the static test, the speed control servo does a dynamic test by automatically actuating the throttle lever from 8 mm (0.315 in) to 12 mm (0.472 in) of travel from the idle position. During the dynamic throttle pull, observe throttle movement to witness any binding or sticking of the speed control cable and correct connection of speed control cable to throttle lever. Make sure the throttle returns to the idle position.

5. Return the ignition switch to the OFF position and proceed to the Symptom Chart.

Did you have the recall done ?
recall 05S28. Description: Speed Control Deactivation Switch.

Try the self test for the Cruise Control :


With the key off depress and hold the cruise control off button while turning the ignition to the run position,don't start the truck, the cruise light will flash once to let you know it is in self test.
Five additional flashes indicate a bad cruise control servo

Release the cruise off switch and within 5 seconds depress the other switches in sequence:
1. on
2. resume
3. coast
4. set/ accel
The speed control light will flash as each switch is depressed.

If the last one does not flash it may then flash a code

After this the cruise will move the throttle to test the actuator and the cable.
Make sure the throttle returns to idle and turn the key off.
----------------------

Self-Test Diagnostics

WARNING:
This test is a key on engine off (KOEO) test only that is conducted in park only with emergency brake fully engaged.

1. Enter self-test diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.

2. Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.

If the ON switch is not depressed within five seconds after entering the diagnostics mode, the module times out and the procedure must be started over.

The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.

Note:
There will be a slight delay when the last button is pressed and the lamp flashes.

3. A lamp flash with the last button (SET/ACCEL) indicates that the static test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.

If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:

- 2 flashes - BPP defective, circuit is defective, brake applied, CPP switch or jumper (if equipped).

- 3 flashes - deactivator switch is open or circuit defective.

- 4 flashes - vehicle speed signal is out of range or circuit is defective

4. Immediately (.25 second delay) after the static test, the speed control servo does a dynamic test by automatically actuating the throttle lever from 8 mm (0.315 in) to 12 mm (0.472 in) of travel from the idle position. During the dynamic throttle pull, observe throttle movement to witness any binding or sticking of the speed control cable and correct connection of speed control cable to throttle lever. Make sure the throttle returns to the idle position.

5. Return the ignition switch to the OFF position and proceed to the Symptom Chart.

Did you have the recall 05S28, Speed Control Deactivation Switch done ? If not, get this done ASAP. If so, could be the inline fuse in the recall harness is blown. Check for leaking brake fluid on the switch, at the end of the brake booster.
You can try the cruise control self test, to see if the CC is functioning.
Self-Test Diagnostics

WARNING:
This test is a key on engine off (KOEO) test only that is conducted in park only with emergency brake fully engaged.

1. Enter self-test diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.

2. Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.

If the ON switch is not depressed within five seconds after entering the diagnostics mode, the module times out and the procedure must be started over.

The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.

Note:
There will be a slight delay when the last button is pressed and the lamp flashes.

3. A lamp flash with the last button (SET/ACCEL) indicates that the static test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.

If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:

— 2 flashes - BPP defective, circuit is defective, brake applied, CPP switch or jumper (if equipped).

— 3 flashes - deactivator switch is open or circuit defective.

— 4 flashes - vehicle speed signal is out of range or circuit is defective

4. Immediately (.25 second delay) after the static test, the speed control servo does a dynamic test by automatically actuating the throttle lever from 8 mm (0.315 in) to 12 mm (0.472 in) of travel from the idle position. During the dynamic throttle pull, observe throttle movement to witness any binding or sticking of the speed control cable and correct connection of speed control cable to throttle lever. Make sure the throttle returns to the idle position.

5. Return the ignition switch to the OFF position and proceed to the Symptom Chart.

Did you have the recall for the cruise control done ?
recall 05S28. Description: Speed Control Deactivation Switch.

It could be the fuse in the recall harness is blown.

Try the Cruise Control Self test :
----------------------------------
Self-Test Diagnostics

WARNING:
This test is a key on engine off (KOEO) test only that is conducted in park only with emergency brake fully engaged.

1. Enter self-test diagnostics by depressing the speed control OFF switch while turning the ignition key ON, making sure the engine does not start and is not running. The speed control indicator on the instrument panel will flash once to indicate that speed control module entered the diagnostic mode. Five additional flashes at this point indicate a defective speed control servo. Release the OFF switch.

2. Press the remaining switches in this sequence: ON, RESUME, COAST and SET/ACCEL.

If the ON switch is not depressed within five seconds after entering the diagnostics mode, the module times out and the procedure must be started over.

The speed control indicator lamp will flash as each switch is depressed. Press each switch in the sequence immediately after the indicator light goes out for the previous switch.

Note:
There will be a slight delay when the last button is pressed and the lamp flashes.

3. A lamp flash with the last button (SET/ACCEL) indicates that the static test passed. If the lamp does not flash with the last button and there are no additional flashes of the lamp, the switch is defective.

If the lamp does not flash with the last button, and additional flashes occur, follow the chart below for trouble codes:

— 2 flashes - BPP defective, circuit is defective, brake applied, CPP switch or jumper (if equipped).

— 3 flashes - deactivator switch is open or circuit defective.

— 4 flashes - vehicle speed signal is out of range or circuit is defective

4. Immediately (.25 second delay) after the static test, the speed control servo does a dynamic test by automatically actuating the throttle lever from 8 mm (0.315 in) to 12 mm (0.472 in) of travel from the idle position. During the dynamic throttle pull, observe throttle movement to witness any binding or sticking of the speed control cable and correct connection of speed control cable to throttle lever. Make sure the throttle returns to the idle position.

5. Return the ignition switch to the OFF position and proceed to the Symptom Chart.
----------------------------

If the Cruise Control does not enter self test, the fuse in the recall harness ( if done ) is most likely blown and needs to be replaced.

look in your owner's manual for the location of the cruse control fuse it is different from other fuses usually much larger

use a scanner to check the abs system . most of the time the abs brakes and traction control system work together. your cruise control . unit has a servo motor .in front right fender well. check the fuse and relay also the cruise control brake release switch. and the brake light switch.if all is good you have a cruise control module problems. dealer ship job.