GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Seville 🢒 DTC 🢒 DTC C1287 Steering Sensor Rate Malfunction

Object Number: 106509 Size: MF
ABS Components
Cell 44: CVRSS, IPM, PCM, MSVA, Class 2 and Traction Control Switch
Handling ESD Sensitive Parts Notice

Circuit Description

The EBTCM learns the steering wheel center position in every drive cycle. Once established, the steering wheel center position should remain fairly constant.

Conditions for Setting the DTC

All of the following conditions occur:

    • The ignition is ON.
    • The steer rate (speed that the steering wheel appears to be turning) exceeds the limits set by the EBTCM.

Action Taken When the DTC Sets
    • A malfunction DTC is stored.
    • Stabilitrak® is disabled.
    • The DIC displays the SERVICE STABILITY SYS message.
    • The ABS/TCS remain functional.

Conditions for Clearing the DTC
    • The condition for DTC is no longer present and you used scan tool Clear DTCs function.
    • The condition for DTC is no longer present and you used the On-Board Clear DTCs function.
    • The EBTCM does not detect the DTC in 50 drive cycles.

Diagnostic Aids
    • Check the vehicle for proper alignment. The car should not pull in either direction while driving straight on a flat surface.
    • Find out from the driver under what conditions the DTC was set (when the DIC displayed the SERVICE STABILITY SYS message). This information will help to duplicate the failure.
    • Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
    • Poor connections, broken insulation, or a break in the wire inside the insulation may cause an intermittent malfunction.
    • If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
    • The Snapshot function on the scan tool can help find an intermittent DTC.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check

2
  1. Turn OFF the ignition.
  2. Connect a scan tool to the data link connector (DLC).
  3. Turn ON the ignition, with the engine OFF.
  4. Using the scan tool, read ABS/TCS/ICCS DTCs.

Are DTCs C1282-C1285 present?

--

Go to Diagnostic Trouble Code (DTC) List

Go to Step 3

3
  1. Start the engine.
  2. Ensure the front wheels are straight.
  3. Turn OFF the ignition.
  4. Restart the engine.
  5. Using the scan tool, select ABS/TCS/ICCS Data Display (1) Diagnostics, DATA LIST 2.
  6. Monitor Digital SWPS Phase A and Digital SWPS Phase B.
  7. Slowly rotate the steering wheel to the left.

Did Digital SWPS Phase A and Digital SWPS Phase B change states as the steering wheel was rotated?

--

Go to Step 4

Go to Step 6

4
  1. Monitor Digital SWPS Phase A and Digital SWPS Phase B.
  2. Slowly rotate the steering wheel to the right.

Did Digital SWPS Phase A and Digital SWPS Phase B change states as the steering wheel was rotated?

--

Go to Step 5

Go to Step 6

5

Perform the Steering Position Sensor Test. Refer to Scan Tool Diagnostics .

Was the Steering Position Sensor Test passed?

--

Go to Step 21

Go to Step 6

6
  1. Turn OFF the ignition.
  2. Disconnect the steering wheel position sensor (SWPS) connector.
  3. Disconnect the EBTCM harness connector.
  4. Install the J 39700 universal pinout box using the J 39700-25 cable adapter to the EBTCM harness connector only.
  5. Turn ON the ignition, with the engine OFF.
  6. Using a J 39200 DMM, measure the voltage between the J 39700 terminals 20 and B.

Is the voltage greater than the specified value?

1 V

Go to Step 7

Go to Step 8

7

Repair the short to voltage in CKT 1763. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check

--

8

Using a J 39200 DMM, measure the voltage between the J 39700 terminals 4 and B.

Is the voltage greater than the specified value?

1 V

Go to Step 9

Go to Step 10

9

Repair the short to voltage in CKT 1764. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check

--

10
  1. Turn OFF the ignition.
  2. Using a J 39200 DMM, measure the resistance between the J 39700 terminals 20 and B.

Is the resistance within the specified range?

OL (infinite)

Go to Step 12

Go to Step 11

11

Repair the short to ground in CKT 1763. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check

--

12

Using a J 39200 DMM, measure the resistance between the J 39700 terminals 4 and B.

Is the resistance within the specified range?

OL (infinite)

Go to Step 14

Go to Step 13

13

Repair the short to ground in CKT 1764 . Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check

--

14

Using a J 39200 DMM, measure the resistance between the J 39700 terminals 20 and 4.

Is the resistance within the specified range?

OL (infinite)

Go to Step 16

Go to Step 15

15

Repair the short between CKT 1763 and CKT 1764. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check

--

16
  1. Connect a fused jumper between the J 39700 terminals 20 and B.
  2. Disconnect the steering wheel position sensor (SWPS) connector.
  3. Using a J 39200 DMM, measure the resistance between the SWPS connector terminal 3 and a good ground.

Is the resistance less than the specified value?

2 ohms

Go to Step 18

Go to Step 17

17

Repair the open in CKT 1763. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check

--

18
  1. Connect a fused jumper between the J 39700 terminals 4 and B.
  2. Using a J 39200 DMM, measure the resistance between the SWPS connector terminal 4 and a good ground.

Is the resistance less than the specified value?

2 ohms

Go to Step 20

Go to Step 19

19

Repair the open in CKT 1764. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Diagnostic System Check

--

20

Replace the steering wheel position sensor (SWPS). Refer to Lower Steering Shaft, Lower Bearing, Column Jacket - Off Vehicle in Steering Wheel and Column - Tilt.

Did you complete the repair?

--

Go to Step 21

--

21
  1. Read Diagnostic Aids and Conditions for Setting the DTC.
  2. Cycle the ignition from the OFF to ON position, engine off.
  3. With a scan tool read ABS/TCS/ICCS DTCs.

Did DTC C1287 reset as a current DTC?

--

Go to Step 22

Go to Diagnostic System Check

22

Replace the EBTCM. Refer to Electronic Brake Control Module Replacement .

Did you complete the repair?

--

Go to Diagnostic System Check

--