For 1990-2009 cars
ABS Components
Antilock Brake System Schematics
Power Distribution Schematics
Data Link Connector Schematics
Handling ESD Sensitive Parts Notice

### Circuit Description

Ignition voltage is supplied to terminal C2 of the Electronic Brake Control Relay. The above condition enables the EBCM/EBTCM to energize the pullin coil by completing the ground circuit at connector C1 terminal A11 of the EBCM/EBTCM. The magnetic field created closes the Electronic Brake Control Relay contacts. The magnetic field also allows battery voltage and current through the Electronic Brake Control Relay terminal C1 to be supplied to the EBCM/EBTCM through connector C2 terminal C and to the Brake Solenoid Valves through S279.

### Conditions for Setting the DTC

DTC C1217 can set before the EBCM/EBTCM commands the Electronic Brake Control Relay on.

DTC C1217 determines if the Electronic Brake Control Relay energizes when the Electronic Brake Control Relay should not energize. The above malfunction would not allow the Electronic Brake Control Relay to remove power to the ABS/TCS system.

If a second malfunction occurs that requires the Electronic Brake Control Relay to turn off the second malfunction cannot be removed if the Electronic Brake Control Relay cannot be controlled.

### Action Taken When the DTC Sets

• | A malfunction DTC stores.

• | The ABS/TCS does not disable.

### Conditions for Clearing the DTC

• | The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTC function is used.

• | 100 drive cycles pass with no DTC detected.

### Diagnostic Aids

The following conditions may cause an intermittent malfunction:

• | A poor connection

• | Rubbed-through wire insulation

• | A broken wire inside the insulation

Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction. Refer to the Scan Tool manual or Scan Tool Diagnostics located in this section for the procedure.

Thoroughly inspect any circuitry that may be causing the intermittent complaint for the following conditions:

• | Backed out terminals

• | Improper mating

• | Broken locks

• | Improperly formed or damaged terminals

• | Poor terminal-to-wiring connections

• | Physical damage to the wiring harness

Clear the DTCs after completing the diagnosis.

Test drive the vehicle for three drive cycles in order to verify that the DTC does not reset.

Use the following procedure in order to complete one drive cycle:

1. Start the vehicle.
2. Drive the vehicle over 16 km/h (10 mph).
3. Stop the vehicle.
4. Turn the ignition to the OFF position.

Important: Zero the J 39200 test leads before making any resistance measurements.

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

1. Turn the ignition switch to the OFF position.
2. Install a Scan Tool
3. Turn the ignition switch to the RUN position (Do not start the engine).
4. Use the relay test function of the Scan Tool in order to command the electronic brake control relay off.

Does the Scan Tool indicate that the electronic brake control relay is off and is the switched battery voltage within the specified voltage?

0-5V

Go to Step 10

Go to Step 3

3 |

1. Turn the ignition switch to the OFF position.
2. Disconnect the 24-way EBCM/EBTCM connector C1.
3. Disconnect the electronic brake control relay connector.
4. Use the J 39200 in order to measure for continuity between the 24-way EBCM/EBTCM connector C1 terminal A11 and ground.

Is continuity present between CKT 1632 and ground?

--

Go to Step 4

Go to Step 5

4 | Repair the short to ground in CKT 1632. Is the repair complete? | -- | Go to Diagnostic System Check | --
5 |

1. Turn the ignition switch to the OFF position.
2. Inspect the following components:

- | The 24-way EBCM/EBTCM connector C1 terminal A11

- | The remaining terminals of the 24-way EBCM/EBTCM connector C1

3. Inspect the above components for the following conditions:

- | Damage

- | Poor terminal contact

- | Terminal corrosion

Are there signs of poor terminal contact, corrosion, or damaged terminals?

--

Go to Step 6

Go to Step 7

6 | Replace all of the terminals or connectors that exhibit signs of poor terminal contact, corrosion, or damaged terminal(s). Is the repair complete? | -- | Go to Diagnostic System Check | --
7 |

1. Turn the ignition switch to the OFF position.
2. Reconnect the electronic brake control relay.
3. Disconnect the EBCM/EBTCM connector C1.
4. Turn the ignition switch to the ON position.
5. Use the J 39200 in order to measure the voltage between the EBCM/EBTCM connector C1 terminal A11 and ground.

Is the voltage within the specified range?

0-2V

Go to Step 11

Go to Step 8

8 |

1. Reconnect the 24-way EBCM/EBTCM connector C1.
2. Turn the ignition switch to the RUN position (Do not start the engine).
3. Use the Scan Tool in order to inspect for DTCs.

Does DTC C1217 set as a current DTC?

--

Go to Step 9

Go to Step 10

9 | Replace the EBCM/EBTCM. Is the repair complete? | -- | Go to Diagnostic System Check | --
10 | The system is functioning properly at this time. The malfunction may be intermittent or is not present at the time of testing. Is a concern still present? | -- | Go to Diagnostic Aids | Go to Diagnostic System Check
11 | Replace the electronic brake control relay. Is the repair complete? | -- | Go to Diagnostic System Check | --