Circuit Description
Ignition voltage is supplied through terminal C10 of the Electronic Brake Control Relay. The above condition enables the EBCM to energize the pullin coil by completing the ground circuit at terminal B8 of Brake Relay connector, by the EBCM through circuit 1632 . 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 B10 to be supplied to the EBTCM through connector C2 terminal C and to the brake solenoid valves through S133.
Conditions for Setting the DTC
DTC 1216 can set anytime.
DTC C1216 detects an open in the Electronic Brake Control Relay coil circuit. An open in the above circuit will not allow the Electronic Brake Control Relay to energize. If the Electronic Brake Control Relay cannot energize, voltage/current fails to reach the motors and solenoids.
DTC C1216 sets alone if the above malfunction exists and the ignition is turned off before reaching 5 km/h (3 mph).
Action Taken When the DTC Sets
| • | A malfunction DTC stores. |
| • | The ABS disables. |
| • | The amber ABS warning indicators turns on. |
| • | The red BRAKE warning indicator turns on if the rear piston in the ABS brake motor pack is not in the home position. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used. |
| • | 100 drive cycles pass with no DTCs 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.
If the frequency of the malfunction is high, but is currently intermittent, inspect for high coil resistance. Use a J 39200 in order to measure for high coil resistance by measuring between Electronic Brake Control Relay terminal C10 and terminal B8. If the resistance shows greater than 95 ohms, replace the Electronic Brake Control Relay.
Thoroughly inspect any circuitry that may be causing the intermittent complaint for the following conditions:
| • | Backed out terminals |
| • | Improper mating |
| • | 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:
- Start the vehicle.
- Drive the vehicle over 16 km/h (10 mph).
- Stop the vehicle.
- 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? | -- | ||||||||||||
2 |
Do not start the engine. Does the scan tool indicate that the Electronic Brake Control (ABS) Relay is on, and is the voltage equal to or greater than the specified voltage? | 10 V | ||||||||||||
3 | Use the J 39200 in order to measure the voltage between the Electronic Brake Control Relay connector terminal C10 and ground. Is the voltage equal to or greater than the specified voltage? | 10 V | ||||||||||||
4 | Use the J 39200 in order to measure the voltage between the Electronic Brake Control Relay connector terminal B8 and ground. Is the voltage equal to or greater than the specified voltage? | 10 V | ||||||||||||
5 |
Do not start the engine. Is the voltage equal to or greater than the specified voltage? | 10 V | ||||||||||||
6 |
Are there signs of poor terminal contact, corrosion, or damaged terminals? | -- | ||||||||||||
7 |
Is the resistance within the specified range? | 0-2 ohms | ||||||||||||
8 |
Do not start the engine. Does DTC C1216 set as current DTC? | -- | ||||||||||||
9 |
Is the voltage equal to or greater than the specified range? | 10 V | ||||||||||||
10 | Use the J 39200 in order to measure the resistance between the ABS Fuse (5A) terminals. Is the resistance within the specified range? | 0-2 ohms | ||||||||||||
11 |
Is the resistance within the specified range? | 0-2 ohms | ||||||||||||
12 |
Is the resistance within the specified range? | OL (Infinite) | ||||||||||||
13 |
Is the resistance within the specified range? | 70-95 ohms | ||||||||||||
14 | Inspect the Electronic Brake Control Relay connector for the following conditions:
Are there signs of damage, poor terminal contact, or terminal corrosion? | -- | ||||||||||||
15 | Repair the open or high resistance in CKT 341. Is the repair complete? | -- | -- | |||||||||||
16 | Repair the open or high resistance in the following Circuits and components:
Refer to Power Distribution Schematics , in Wiring. Is the repair complete? | -- | -- | |||||||||||
17 | Replace all of the terminals that display signs of poor terminal contact, corrosion, or damaged terminals. Is the repair complete? | -- | -- | |||||||||||
18 | Repair the open or high resistance in CKT 1632. Is the repair complete? | -- | -- | |||||||||||
19 | Repair the short to ground in CKT 341. Is the repair complete? | -- | -- | |||||||||||
20 | Replace the fuse block Fuse 13 (10A) with a known good fuse. Is the repair complete? | -- | -- | |||||||||||
21 | Replace the Electronic Brake Control Relay. Refer to Electronic Brake Control Relay Replacement . Is the repair complete? | -- | -- | |||||||||||
22 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- | |||||||||||
23 | Is the malfunction intermittent or is not present at this time? | -- | Go to Diagnostic Aids | -- |
