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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 914 (CRUISE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESCRUISE CONTROL INOPERATIVE/MALFUNCTIONING (L81)CONDITIONS FOR ENABLING CRUISE CONTROL
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Conditions for Enabling Cruise Control

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Conditions for Enabling Cruise Control
WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  • The vehicle speed is greater than 40 km/h (25 mph).
  • The vehicle is not in PARK, REVERSE, NEUTRAL, or 1st gear.
  • The system voltage is between 12 volts and 16 volts.
Cruise Control Inoperative/Malfunctioning (L81)

Step Action Yes No
Schematic Reference: Cruise Control Schematics (3.0L)  or Cruise Control Schematics (2.2L) 
Connector End View Reference: Cruise Control Connector End Views , Lighting Systems Connector End Views in Lighting Systems.
1 Did you perform the Cruise Control Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Cruise Control 
2
  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. Turn the cruise control On/Off switch OFF.
  4. With the scan tool, observe the Cruise Switch parameter in the ECM General Info - Inputs data list.
Does the Cruise Switch parameter display Off?		 Go to Step 3  Go to Step 13 
3
  1. With the scan tool, observe the Cruise Switch parameter.
  2. Turn the cruise On/Off switch ON.
Does the Cruise Switch parameter display On?		 Go to Step 4  Go to Step 14 
4
  1. With the scan tool, observe the Cruise Set/Coast parameter in the ECM General Info - Inputs data list.
  2. Turn the cruise On/Off switch ON.
Does the Cruise Set/Coast parameter display On?		 Go to Step 15  Go to Step 5 
5
  1. With the scan tool, observe the Cruise Set/Coast parameter.
  2. Press and hold the set/coast switch.
Does the Cruise Set/Coast parameter display On?		 Go to Step 6  Go to Step 20 
6
  1. With the scan tool, observe the Cruise Resume/Accel parameter in the ECM General Info - Inputs data list.
  2. Turn the cruise On/Off switch ON.
Does the Cruise Resume/Accel parameter display On?		 Go to Step 16  Go to Step 7 
7
  1. With the scan tool, observe the Cruise Resume/Accel parameter.
  2. Press and hold the resume/accel switch.
Does the Cruise Resume/Accel parameter display On?		 Go to Step 8  Go to Step 21 
8 With the scan tool, observe the Cruise Brake Switch parameter in the ECM General Info - Inputs data list.
Does the Cruise Brake Switch parameter display released?		 Go to Step 9  Go to Step 12 
9
  1. With the scan tool, observe the Cruise Brake Switch parameter.
  2. Press and hold the brake pedal.
Does the Cruise Brake Switch parameter display Applied?		 Go to Step 10  Go to Step 11 
10
  1. With the scan tool, observe the Brake Switch parameter in the ECM General Info - Inputs data list.
  2. Press and hold the brake pedal.
Does the Cruise Brake Switch parameter display Applied?		 Go To Diagnostic Aids Go to Step 26 
11
  1. Turn the ignition OFF.
  2. Disconnect the cruise/brake switch.
  3. With the scan tool, observe the Cruise Brake Switch parameter.
Does the Cruise Brake Switch parameter display Applied?		 Go to Step 29  Go to Step 24 
12
  1. Turn the ignition OFF.
  2. Disconnect the cruise/brake switch.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a test lamp between the ignition 1 voltage circuit and a good ground.
Does the test lamp illuminate?		 Go to Step 25  Go to Step 30 
13
  1. Turn the ignition OFF.
  2. Disconnect the cruise switch.
  3. Turn the ignition ON, with the engine OFF.
  4. Observe the Cruise Switch parameter.
Does the Cruise Switch parameter display Off?		 Go to Step 27  Go to Step 22 
14
  1. Turn the ignition OFF.
  2. Disconnect cruise switch.
  3. Turn the ignition ON, with the engine OFF.
  4. Connect a test lamp between the ignition 1 voltage circuit and a good ground.
Does the test lamp illuminate?		 Go to Step 17  Go to Step 30 
15
  1. Turn the ignition OFF.
  2. Disconnect the cruise switch.
  3. Turn the ignition ON, with the engine OFF.
  4. Observe the Cruise Set/Coast parameter.
Does the Cruise Set/Coast parameter display Off?		 Go to Step 27  Go to Step 18 
16
  1. Turn the ignition OFF.
  2. Disconnect the cruise switch.
  3. Turn the ignition ON, with the engine OFF.
  4. Observe the Cruise Resume/Accel parameter.
Does the Cruise Resume/Accel parameter display Off?		 Go to Step 27  Go to Step 19 
17
  1. Connect a 3 ampere fused jumper between the ignition 1 voltage circuit and the cruise control on switch signal circuit.
  2. With the scan tool, observe the Cruise Switch parameter.
Does the Cruise Switch parameter display On?		 Go to Step 27  Go to Step 23 
18 Test the cruise control set/coast switch signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 28 
19 Test the cruise control resume/accel switch signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 28 
20 Test the cruise control set/coast switch signal circuit for a short to ground, for an open, or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 27 
21 Test the cruise control resume/accel switch signal circuit for a short to ground, for an open, or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 27 
22 Test the cruise control on switch signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 28 
23 Test the cruise control on switch signal circuit for an open, for a short to ground, or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 28 
24 Test the cruise/brake switch signal circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 28 
25 Test the cruise/brake switch signal circuit for an open, for a short to ground, or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 29 
26 Test the stop lamp switch signal circuit for an open, for a short to ground, or for a high resistance between S200. and the ECM. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 28 
27 Inspect for poor connections at the harness connector of the cruise control switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 31 
28 Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 33 
29 Inspect for poor connections at the harness connector of the cruise/brake switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 34  Go to Step 32 
30 Repair the short to ground, the open, or the high resistance in the ignition 1 voltage circuit. Refer to Wiring Repairs Wiring Systems.
Did you complete the repair?		 Go to Step 34  -
31 Replace the cruise control switch. Refer to Cruise Control Switch Replacement .
Did you complete the replacement?		 Go to Step 34  -
32 Replace the cruise/brake switch. Refer to Cruise Release Switch Replacement .
Did you complete the replacement?		 Go to Step 34  -
33
IMPORTANT: Program the replacement ECM.
Replace the ECM. Refer to ENGINE CONTROL MODULE .Did you complete the replacement?		 Go to Step 34  -
34
  1. Enable the inflatable restraint steering wheel module. Refer to DISABLING & ACTIVATING AIR BAG SYSTEM in SIR
  2. Operate the vehicle with in the conditions for cruise control operation.
Does the cruise control system operate properly?		 System OK Go to Step 2 
RENDER: 1.0x

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