LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Cruise Control) >> Diagnostic Information and Procedures >> Cruise Control Inoperative/Malfunctioning >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 8:  This step tests the center high mount stop lamp (CHMSL) supply voltage/stop lamp supply voltage circuit for an open or for a high resistance between the stop lamp switch and the throttle actuator control (TAC) module.
  2. 9:  This step tests the cruise control set/coast switch signal circuit for an open or for a high resistance.
  3. 10:  This step tests the cruise control resume/accel switch signal circuit for an open or for a high resistance.
  4. 11:  This step tests the ignition 3 voltage circuit for an open, for a short to ground, or for a high resistance.
  5. 29:  DTCs will set in the powertrain control module (PCM) when you perform this table.
Cruise Control Inoperative/Malfunctioning

Step Action Yes No
Schematic Reference: Cruise Control Schematics 
Connector End View Reference: Lighting Systems Connector End Views or Powertrain Control Module Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn the cruise control On/Off switch OFF.
  4. With the scan tool, observe the Cruise On/Off Switch parameter in the powertrain control module (PCM) Cruise Control Data list.
Does the Cruise On/Off Switch parameter display Off?		 Go to Step 4  Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Disconnect C4 of the multifunction switch.
  3. Turn ON the ignition, with the engine OFF.
  4. With the scan tool, observe the Cruise On/Off Switch parameter.
Does the Cruise On/Off Switch parameter display Off?		 Go to Step 22  Go to Step 13 
4
  1. Turn the cruise control On/Off switch ON.
  2. With the scan tool, observe the Cruise On/Off Switch parameter.
Does the Cruise On/Off Switch parameter display On?		 Go to Step 5  Go to Step 11 
5
  1. With the scan tool, observe the Cruise Set/Coast Switch parameter in the PCM Cruise Control Data list.
  2. Turn the cruise control On/Off switch On.
  3. Press and hold the cruise control set/coast button.
Does the Cruise Set/Coast Switch parameter Display On?		 Go to Step 6  Go to Step 9 
6
  1. With the scan tool, observe the Cruise Resume/Accel. Switch parameter in the PCM Cruise Control Data list.
  2. Press and hold the resume/accel switch.
Does the Cruise Resume/Accel. Switch parameter Display On?		 Go to Step 7  Go to Step 10 
7 Do the stop lamps operate properly? Go to Step 8  Go to Stop Lamps Inoperative
8 
  1. With the scan tool, observe the Stop Lamp Pedal Switch parameter in the PCM Cruise Control Data list.
  2. Depress and hold the brake pedal.
Does the Stop Lamp Pedal Switch parameter Display Applied?		 Go to Diagnostic Aids Go to Step 21 
9 
  1. Turn OFF the ignition.
  2. Disconnect C4 of the multifunction switch.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a 3-amp fused jumper between the cruise control set/coast switch signal circuit and the ignition 3 voltage circuit.
  5. With the scan tool, observe the Cruise Set/Coast Switch parameter.
Does the Cruise Set/Coast Switch parameter Display On?		 Go to Step 22  Go to Step 19 
10 
  1. Turn OFF the ignition.
  2. Disconnect C4 of the multifunction switch.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a 3-amp fused jumper between the cruise control resume/accel switch signal circuit and the ignition 3 voltage circuit.
  5. With the scan tool, observe the Cruise Resume/Accel. Switch parameter.
Does the Cruise Resume/Accel. Switch parameter Display On?		 Go to Step 22  Go to Step 20 
11 
  1. Turn OFF the ignition.
  2. Disconnect C4 of the multifunction switch.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the ignition 3 voltage circuit and a good ground.
Does the test lamp illuminate?		 Go to Step 12  Go to Step 15 
12
  1. Connect a 3-amp fused jumper between the ignition 3 voltage circuit and the cruise control on switch signal circuit.
  2. With the scan tool, observe the Cruise On/Off Switch parameter.
Does the Cruise On/Off Switch parameter display On?		 Go to Step 22  Go to Step 18 
13 Test the cruise control on switch signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 14 
14
  1. Turn OFF the ignition.
  2. Disconnect C1 of the throttle actuator control (TAC) module.
  3. Turn ON the ignition, with the engine OFF.
  4. With the scan tool, observe the Cruise On/Off Switch parameter.
Does the Cruise On/Off Switch parameter display On?		 Go to Step 24  Go to Step 23 
15 Test the cruise control set/coast switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 16 
16 Test the cruise control resume/accel switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 17 
17 Test the cruise control on switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 25 
18 Test the cruise control on switch signal circuit for the following:
  • An open
  • A high resistance
  • A short to ground

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 23 
19 Test the cruise control set/coast switch signal circuit for the following:
  • An open
  • A high resistance
  • A short to ground

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 23 
20 Test the cruise control resume/accel switch signal circuit for the following:
  • An open
  • A high resistance
  • A short to ground

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 23 
21 Test the center high mount stop lamp (CHMSL) supply voltage/stop lamp supply voltage circuit for an open or for a high resistance between the stop lamp switch and the TAC module. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 23 
22 Inspect for poor connections at the harness connector of the cruise control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 26 
23 Inspect for poor connections at the harness connector of the TAC module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 27 
24 Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 Go to Step 29  Go to Step 28 
25 Repair the open, the high resistance, or the short to ground in the ignition 3 voltage circuit. Refer to Circuit Testing and Wiring Repairs .
Did you complete the repair?		 Go to Step 29  -
26 Replace the multifunction switch. Refer to Turn Signal Multifunction Switch Replacement .
Did you complete the replacement?		 Go to Step 29  -
27 Replace the TAC module. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 29  -
28 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 Go to Step 29  -
29 
  1. Use the scan tool in order to clear the PCM DTCs.
  2. Operate the vehicle within the conditions for cruise control operation.
Does the cruise control system operate properly?		 System OK Go to Step 2 
scientia non olet · About LEMON Manuals