Cruise Control Inoperative. GMC Truck Savana 1999

GM Service Manual Online

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 Savana 🢒 Body and Accessories 🢒 Cruise Control 🢒 Cruise Control Inoperative

Cruise Control Inoperative Gasoline Engine

Step

Action

Value(s)

Yes

Was the Cruise Control System Check performed?

Go to Step 2

Go to Cruise Control System Check

Verify that no diagnostic trouble codes (DTC's) are set which would impact the cruise control operations.
Disconnect the connector at the cruise control module.
Place the ignition switch in the RUN position.
Connect an unpowered test lamp between the cruise control module connector cavity F CKT 41 (BRN) and ground.

Does the test lamp light?

Go to Step 4

Go to Step 3

Repair the open in CKT 41 (BRN) between the instrument panel (IP) fuse block and the cruise control module.

Is the cruise control still inoperative?

Go to Step 4

Go to Cruise Control System Check

Connect a J 39200 between the cruise control module connector cavity E for CKT 451 (BLK/WHT) and ground.

Is continuity present?

Go to Step 6

Go to Step 5

Repair the open in CKT 451 (BLK/WHT) between the cruise control module and ground G101/G103.

Is the cruise control still inoperative?

Go to Step 6

Go to Cruise Control System Check

Place the cruise control switch in the ON position.
Connect an unpowered test lamp between the cruise control module connector cavity A for CKT 397 (GRY) and ground.

Does the test lamp light?

Go to Step 14

Go to Step 7

Disconnect connector C200 at the steering column.
Connect an unpowered test lamp between connector C200 pin A13 for CKT 41 (BRN) and ground.

Does the test lamp light?

Go to Step 9

Go to Step 8

Repair the open in CKT 41 (BRN) between the IP fuse block and connector C200.

Is the cruise control still inoperative?

Go to Step 9

Go to Cruise Control System Check

Connect a J 39200 between connector C200 cavity A13 for the CKT 41 (BRN) pigtail wire and cavity A12 for CKT 397 (GRY) at the cruise control switch.

Is continuity present?

Go to Step 10

Go to Step 11

Repair the open in CKT 397 (GRY) between connector C200 and the cruise control module.

Is the cruise control still inoperative?

Go to Step 14

Go to Cruise Control System Check

Inspect for an open in the CKT 41 (BRN) pigtail wire or in the CKT 397 (GRY) pigtail wire in the steering column.

Did you find an open?

Go to Step 12

Go to Step 13

Repair the open in the CKT 41 (BRN) pigtail wire or in the CKT 397 (GRY) pigtail wire in the steering column.

Is the cruise control still inoperative?

Go to Step 14

Go to Cruise Control System Check

Replace the multifunction lever which includes the cruise control switch. Refer to Cruise Control Switch Replacement .

Is the cruise control still inoperative?

Go to Step 14

Go to Cruise Control System Check

Place the cruise control switch in the OFF position.
Connect an unpowered test lamp between the cruise control module connector cavity B for CKT 84 (DK BLU) and ground.

Does the test lamp light?

Go to Step 15

Go to Step 16

Repair the short to voltage in CKT 84 (DK BLU) between the cruise control switch and the cruise control module.

Is the cruise control still inoperative?

Go to Step 16

Go to Cruise Control System Check

Turn the cruise control to the ON position.
Connect an unpowered test lamp between the cruise control module connector cavity B for CKT 84 (DK BLU) and ground.
Depress the SET/COAST push-button.

Does the test lamp light?

Go to Step 22

Go to Step 17

Disconnect connector C200 at the steering column.
Connect a J 39200 between the cruise control module connector cavity B and connector C200 pin A14 for CKT 84 (DK BLU).

Is continuity present?

Go to Step 18

Go to Step 21

Inspect for an open in the CKT 84 (DK BLU) pigtail wire in the steering column.

Did you find an open?

Go to Step 19

Go to Step 20

Repair the open in the CKT 84 (DK BLU) pigtail wire in the steering column.

Is the cruise control still inoperative?

Go to Step 22

Go to Cruise Control System Check

Replace the multifunction lever which includes the cruise control switch. Refer to Cruise Control Switch Replacement .

Is the cruise control still inoperative?

Go to Step 22

Go to Cruise Control System Check

Repair the open in CKT 84 (DK BLU) between connector C200 and the cruise control module.

Is the cruise control still inoperative?

Go to Step 22

Go to Cruise Control System Check

Connect an unpowered test lamp between the cruise control module connector cavity G for CKT 17 (WHT) and ground.

Does the test lamp light?

Go to Step 23

Go to Step 26

Disconnect the connector at the torque convertor clutch (TCC)/stoplamp switch.
Connect a J 39200 at the TCC/stoplamp switch between pin E and pin F.

Is continuity present?

Go to Step 24

Go to Step 25

Ensure that the contacts in the TCC/stoplamp switch are open without the brake pedal depressed.
Adjust or replace the TCC/stoplamp switch as needed. Refer to TCC/Stoplamp Switch Replacement in Brakes.

Is the cruise control still inoperative?

Go to Step 26

Go to Cruise Control System Check

Repair the short to voltage in CKT 17 (WHT) between the TCC/stoplamp switch and the cruise control module.

Is the cruise control still inoperative?

Go to Step 26

Go to Cruise Control System Check

Connect an unpowered test lamp between the cruise control module connector cavity G for CKT 17 (WHT) and ground.
Depress the brake pedal.

Does the test lamp light?

Go to Step 30

Go to Step 27

Disconnect the connector at the TCC/stoplamp switch.
Connect a J 39200 between the TCC/stoplamp switch connector cavity F and the cruise control module connector cavity G for CKT 17 (WHT).

Is continuity present?

Go to Step 28

Go to Step 29

Replace the TCC/stoplamp switch. Refer to TCC/Stoplamp Switch Replacement in Brakes.

Is the cruise control still inoperative?

Go to Step 30

Go to Cruise Control System Check

Repair the open in CKT 17 (WHT) between the cruise control switch and the cruise control module.

Is the cruise control still inoperative?

Go to Step 30

Go to Cruise Control System Check

Connect an unpowered test lamp between the cruise control module connector cavity D for CKT 420 (PPL) and ground.

Does the test lamp light?

Go to Step 38

Go to Step 31

Disconnect the connector at the TCC/stoplamp switch.
Connect a J 39200 at the TCC/stoplamp switch between pin D and pin C.

Is continuity present?

Go to Step 33

Go to Step 32

Adjust or replace the TCC/stoplamp switch as needed. Refer to TCC/Stoplamp Switch Replacement in Brakes.

Is the cruise control still inoperative?

Go to Step 33

Go to Cruise Control System Check

Connect an unpowered test lamp between the TCC/stoplamp switch connector cavity D for CKT 441 (BRN) and ground.

Does the test lamp light?

Go to Step 34

Go to Step 35

Repair the open in CKT 420 (PPL) between the TCC/stoplamp switch and the cruise control module.

Is the cruise control still inoperative?

Go to Step 38

Go to Cruise Control System Check

Inspect for an open in CKT 441 (BRN) between the IP fuse block and the TCC/stoplamp switch.

Did you find an open?

Go to Step 36

Go to Step 37

Repair the open in CKT 441 (BRN) between the IP fuse flock and the TCC/stoplamp switch.

Is the cruise control still inoperative?

Go to Step 38

Go to Cruise Control System Check

Check for any DTC's related to the Antilock Brake System. Refer to the DTC Reference Table in Antilock Brakes.

Is the cruise control still inoperative?

Go to Step 38

Go to Cruise Control System Check

Connect a voltmeter between the cruise control module connector cavity K for CKT 817 (DK GRN/WHT) and ground.

Is there any battery voltage present?

Go to Step 39

Go to Step 42

Disconnect connector C4 at the vehicle control module (VCM).
Connect a voltmeter between the cruise control module connector cavity K for CKT 817 (DK GRN/WHT) and ground.

Is there any battery voltage present?

Go to Step 40

Go to Step 41

Repair the short to voltage in CKT 817 (DK GRN/WHT) between the following components:

•	The cruise control module

•

The radio

•

The VCM

Is the cruise control still inoperative?

Go to Step 42

Go to Cruise Control System Check

Replace the VCM. Refer to VCM Replacement in Engine Controls.

Is the cruise control still inoperative?

Go to Step 42

Go to Cruise Control System Check

Disconnect connector C4 at the VCM.
Connect a J 39200 between the VCM connector C4 cavity 3 and the cruise control module connector cavity K for CKT 817 (DK GRN/WHT).

Is continuity present?

Go to Step 44

Go to Step 43

Repair the open in CKT 817 (DK GRN/WHT) between the VCM and the cruise control module.

Is the cruise control still inoperative?

Go to Step 44

Go to Cruise Control System Check

Connect a J 39200 between the cruise control module connector cavity K for CKT 817 (DK GRN/WHT) and ground.

Is continuity present?

Go to Step 45

Go to Step 46

Repair the short to ground in CKT 817 (DK GRN/WHT) between the VCM and the cruise control module.

Is the cruise control still inoperative?

Go to Step 46

Go to Cruise Control System Check

Reconnect connector C4 at the VCM.
Prepare to operate the vehicle at speed.
Leave the cruise control module connector disconnected.
Connect a voltmeter between the cruise control module connector cavity K for CKT 817 (DK GRN/WHT) and ground.
Operate the vehicle at speed.
Observe the voltage between the range depending upon the speed.
Ensure that the radio is OFF.

Does the voltmeter indicate the voltage in the range as a function of speed?

0-5 volts

Go to Step 47

Go to Step 48

Replace the VCM. Refer to VCM Replacement in Engine Controls.

Is the cruise control still inoperative?

Go to Step 48

Go to Cruise Control System Check

Continue to operate the vehicle at speed.
Turn on the radio.

Does the voltmeter indicate the voltage in the range as a function of speed?

0-5 volts

Go to Step 49

Go to Step 50

Replace the radio. Refer to Radio Replacement .

Is the cruise control still inoperative?

Go to Cruise Control System Check

Replace the cruise control module.

Is the cruise control still inoperative?

Go to Cruise Control System Check

Cruise Control Inoperative Diesel Engine

Step	Action	Value(s)	Yes	No
1	Was the Cruise Control System Check performed?	--	Go to Step 2	Go to Cruise Control System Check
2	Verify that no diagnostic trouble codes (DTC's) are set which would impact the cruise control operation. Place the ignition switch in the RUN position. Disconnect connector C2 at the powertrain control module (PCM). Connect an unpowered test lamp between the PCM connector C2 cavity A11 for CKT 397 (GRY) and ground. Place the cruise control switch in the ON position. Does the test lamp light?	--	Go to Step 10	Go to Step 3
3	Disconnect connector C200 at the steering column. Connect an unpowered test lamp between connector C200 pin A13 for CKT 41 (BRN) and ground. Does the test lamp light?	--	Go to Step 5	Go to Step 4
4	Repair the open in CKT 41 (BRN) between the instrument panel (IP) fuse block and connector C200. Is the cruise control still inoperative?	--	Go to Step 5	Go to Cruise Control System Check
5	Connect a J 39200 between connector C200 cavity A13 for the CKT 41 (BRN) pigtail wire and cavity A12 for the CKT 397 (GRY) pigtail wire. Is continuity present?	--	Go to Step 6	Go to Step 7
6	Repair the open in CKT 397 (GRY) between connector C200 and the PCM. Is the cruise control still inoperative?	--	Go to Step 10	Go to Cruise Control System Check
7	Inspect for an open in the CKT 41 (BRN) pigtail wire or in the CKT 397 (GRY) pigtail wire in the steering column. Did you find an open?	--	Go to Step 8	Go to Step 9
8	Repair the open in the CKT 41 (BRN) pigtail wire or in the CKT 397 (GRY) pigtail wire in the steering column. Is the cruise control still inoperative?	--	Go to Step 10	Go to Cruise Control System Check
9	Replace the multifunction lever which contains the cruise control switch. Refer to Cruise Control Switch Replacement . Is the cruise control still inoperative?	--	Go to Step 10	Go to Cruise Control System Check
10	Connect an unpowered test lamp between the PCM connector C2 cavity B11 for CKT 84 (DK BLU) and ground. Actuate the SET/COAST switch on the cruise control switch. Does the test lamp light?	--	Go to Step 16	Go to Step 11
11	Disconnect connector C200 at the steering column. Connect a J 39200 between connector C200 cavity A13 for the CKT 41 (BRN) pigtail wire and cavity A14 for the CKT 84 (DK BLU) pigtail wire. Actuate the SET/COAST switch on the cruise control switch. Is continuity present?	--	Go to Step 12	Go to Step 13
12	Repair the open in CKT 84 (DK BLU) between connector C200 and the PCM. Is the cruise control still inoperative?	--	Go to Step 16	Go to Cruise Control System Check
13	Inspect for an open in the CKT 84 (DK BLU) pigtail wire in the steering column. Did you find an open?	--	Go to Step 14	Go to Step 15
14	Repair the open in the CKT 84 (DK BLU) pigtail wire in the steering column. Is the cruise control still inoperative?	--	Go to Step 16	Go to Cruise Control System Check
15	Replace the multifunction lever which contains the cruise control switch. Refer to Cruise Control Switch Replacement . Is the cruise control still inoperative?	--	Go to Step 16	Go to Cruise Control System Check
16	Connect an unpowered test lamp between the PCM connector C2 cavity B10 for CKT 17 (WHT) and ground. Does the test lamp light?	--	Go to Step 17	Go to Step 20
17	Disconnect the connector at the torque convertor clutch (TCC)/stoplamp switch. Connect a J 39200 between the TCC/stoplamp switch pin F and pin E. Is continuity present?	--	Go to Step 18	Go to Step 19
18	Ensure that the contact in the TCC/stoplamp switch is open. Adjust or replace the TCC/stoplamp switch as needed. Refer to TCC/Stoplamp Replacement in Brakes. Is the cruise control still inoperative?	--	Go to Step 20	Go to Cruise Control System Check
19	Repair the short to voltage in CKT 17 (WHT) between the TCC/stoplamp switch and the PCM. Is the cruise control still inoperative?	--	Go to Step 20	Go to Cruise Control System Check
20	Depress the brake pedal. Does the test lamp light?	--	Go to Step 26	Go to Step 21
21	Disconnect the connector at the TCC/stoplamp switch. Connect an unpowered test lamp between the TCC/stoplamp switch connector cavity E for CKT 140 (ORN) and ground. Does the test lamp light?	--	Go to Step 23	Go to Step 22
22	Repair the open in CKT 140 (ORN) between the IP fuse block and the TCC/stoplamp switch. Is the cruise control still inoperative?	--	Go to Step 23	Go to Cruise Control System Check
23	Connect a J 39200 between the TCC/stoplamp switch pin E and pin F. Depress the brake pedal. Is continuity present?	--	Go to Step 24	Go to Step 25
24	Repair the open in CKT 17 (WHT) between the TCC/stoplamp switch and the PCM. Is the cruise control still inoperative?	--	Go to Step 26	Go to Cruise Control System Check
25	Ensure that the contact in the TCC/stoplamp switch is closed with the brake pedal depressed. Adjust or replace the TCC/stoplamp switch as needed. Refer to TCC/Stoplamp Switch Replacement in Brakes. Is the cruise control still inoperative?	--	Go to Step 26	Go to Cruise Control System Check
26	Connect an unpowered test lamp between the PCM connector C2 cavity B9 for CKT 420 (PPL) and ground. Does the test lamp light?	--	Go to Step 27	Go to Step 28
27	Replace the PCM. Refer to PCM Replacement in Engine Controls. Is the cruise control still inoperative?	--	Go to Step 28	Go to Cruise Control System Check
28	Disconnect the connector at the TCC/stoplamp switch. Connect an unpowered test lamp between the TCC/stoplamp switch cavity D for CKT 441 (BRN) and ground. Does the test lamp light?	--	Go to Step 30	Go to Step 29
29	Repair the open in CKT 441 (BRN) between the IP fuse block and the TCC/stoplamp switch. Is the cruise control still inoperative?	--	Go to Step 30	Go to Cruise Control System Check
30	Connect a J 39200 between the TCC/stoplamp switch pin D and pin C (backprobe). Observe that the test lamp lights. Depress the brake pedal. Is continuity present?	--	Go to Step 31	Go to Step 32
31	Adjust or replace the TCC/stoplamp switch. Refer to TCC/Stoplamp Switch Replacement in Brakes. Is the cruise control still inoperative?	--	--	Go to Cruise Control System Check
32	Repair the open in CKT 420 (PPL) between the TCC/stoplamp switch and the PCM. Is the cruise control still inoperative?	--	--	Go to Cruise Control System Check