For 1990-2009 cars
ABS Components
Antilock Brake System Schematics

### Circuit Description

Replacement EBTCMs require the variant coding to be programmed in to the EBTCM memory. Program the EBTCM if a new EBTCM is installed in a vehicle. The programming is performed with the scan tool. When ABS Programming is performed with the scan tool, the engine type and the transmission type are coded into the EBTCM memory. The EBTCM requires the engine and transmission coding for TCS operation.

### Conditions for Setting the DTC

The Variant Coding has not been programmed into the EBTCM.

### Action Taken When the DTC Sets

• | A malfunction DTC is stored.

• | The TC indicator lamp is turned on.

• | The TCS will be disabled.

• | The ABS remains functional.

### Conditions for Clearing the DTC

• | The condition for the DTC is no longer present.

• | The scan tool Clear DTCs function is used.

• | 100 drive cycles have passed with no DTCs detected.

### Diagnostic Aids

In the most unfavorable circumstances, incorrect programming can lead to minor driveability problems.

### Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

1. If DTC 65 is set as a current DTC, perform the ABS Programming in ABS diagnostics of the scan tool.

#### DTC 65 - Variant Coding Traction Control Malfunction

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was a Diagnostic System Check performed? | -- | Go to Step 2 | Go to A Diagnostic System Check
2 |

1. Install a scan tool.
2. Turn the ignition switch to the RUN position with the engine off.
3. Use the scan tool to read the DTCs.

Did DTC 65 set as a current DTC?

--

Go to Step 3

Go to Step 4

3 | The EBTCM requires ABS Programming. Perform the following step:

1. Use a scan tool to select ABS Diagnostics.
2. Select and run ABS Programming in ABS Diagnostics.

is the programming complete?

--

Go to A Diagnostic System Check

--

4 | The malfunction is intermittent or not present at this time. Refer to Diagnostic Aids on the facing page for additional information. Is the diagnosis complete? | -- | Go to A Diagnostic System Check | --