Caution: Refer to SIR Caution in the Preface section.
Disable the inflatable restraint steering wheel module when performing this diagnostic table. Refer to SIR Disabling and Enabling in SIR.
Perform the following in order to avoid misdiagnosis:
• | Ensure that the following cruise control switches are not stuck in the engaged position: |
- | On/Off switch |
- | Set/Coast switch |
- | Resume/Accel switch |
- | Cancel switch |
• | Inspect for proper operation of the stop lamps. Refer to Exterior Lighting Systems Description and Operation in Wiring Systems. |
• | Rotate the steering wheel to both steering stops and activate each cruise control switch separately. With a scan tool, observe the associated cruise control switch parameter in the Body and Accessories Cruise Control data list. This will help eliminate the possibility of a internally open or shorted inflatable restraint steering wheel module coil. |
• | For an intermittent condition, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
The number below refers to the step number on the diagnostic path.
Step | Action | Values | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Cruise Control Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems | ||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information | ||||||
2 | Is DTC P0573 current in the powertrain control module (PCM)? | -- | Go to DTC P0573 in Lighting Systems | Go to Step 3 | ||||||
3 |
Do any of the parameters listed above display On? | -- | Go to Step 13 | Go to Step 4 | ||||||
4 |
Does the Cruise On/Off Switch parameter display On? | -- | Go to Step 5 | Go to Step 9 | ||||||
5 |
Does the Cruise Set/Coast Switch parameter display On? | -- | Go to Step 6 | Go to Step 11 | ||||||
6 |
Does the Cruise Resume/Accel Switch parameter display On? | -- | Go to Step 7 | Go to Step 11 | ||||||
7 |
Does the voltage measure at or greater than the specified voltage? | 0.5 V | Go to Step 19 | Go to Step 8 | ||||||
8 |
Does the voltage measure at the specified voltage? | B+ | Go to Step 12 | Go to Step 20 | ||||||
9 |
Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 22 | ||||||
10 |
Important: The cruise control on/off switch must be turned ON in order to correctly view the Cancel switch, set/coast switch, and the resume/accel switch resistance values with the DMM.
Do the cruise control function switch resistance values measure between the specified values? | Off = O.L. On = 7.8 K-8.6 K ohms Resume = 2.7 K-3.0 K ohms Set = 1.2 K-1.3 K ohms Cancel = 0-1 K ohms | Go to Step 15 | Go to Step 16 | ||||||
11 |
Important: The cruise control on/off switch must be turned ON in order to correctly view the Cancel switch, set/coast switch, and the resume/accel switch resistance values with the DMM.
Do the cruise control function switch resistance values measure between the specified values? | Off = O.L. On = 7.8 K-8.6 K ohms Resume = 2.7 K-3.0 K ohms Set = 1.2 K-1.3 K ohms Cancel = 0-1 K ohms | Go to Step 15 | Go to Step 16 | ||||||
12 |
Does the voltage measure greater than the specified value? | 8.5 V | Go to Step 18 | Go to Step 21 | ||||||
13 |
Do any of the parameters listed above display On? | -- | Go to Step 14 | Go to Step 16 | ||||||
14 | Test the cruise control set/coast and resume/accel switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 17 | ||||||
15 | Test the cruise control Set/Coast and Resume/Accel switch signal circuit for the following:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 17 | ||||||
16 | 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 23 | ||||||
17 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 25 | ||||||
18 | Inspect for poor connections at the harness connector of the TAC module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 26 | Go to Step 24 | ||||||
19 | Repair the short to voltage in the cruise control cancel signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 26 | -- | ||||||
20 | Repair the following in the cruise control cancel signal circuit:
Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 26 | -- | ||||||
21 | Repair the open or the high resistance in the stop lamp switch signal circuit between the underhood fuse block and the TAC module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 26 | -- | ||||||
22 | Repair the open, the short to ground, or the high resistance in the ignition 1 voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 26 | -- | ||||||
23 | Replace the cruise control switch. Refer to Cruise Control Switch Replacement . Did you complete the replacement? | -- | Go to Step 26 | -- | ||||||
24 | Replace the TAC module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 26 | -- | ||||||
25 | Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 26 | -- | ||||||
Does the cruise control system operate properly? | -- | System OK | Go to Step 2 |