DTC C1216 Brake Control Relay Coil Circuit Open. Buick Century 1998

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1998 🢒 Century 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C1216 Brake Control Relay Coil Circuit Open

DTC C1216 Brake Control Relay Coil Circuit Open 2

ABS Components
Antilock Brake System Schematics
Handling ESD Sensitive Parts Notice
Power Distribution Schematics

Circuit Description

Ignition voltage is supplied through terminal A1 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 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/ETS/TCS disables.

•	The amber ABS/ETS/TCS warning indicator(s) 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 DTC(s) detected.

Diagnostic Aids

The following conditions may cause an intermittent malfunction:

•	A poor connection

•	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 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 85 and terminal 86. 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

•	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:

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. Refer to the J 39200 user's manual.

Step

Action

Value(s)

Yes

Was the Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check

Turn the ignition switch to the OFF position.
Install a Scan Tool .
Turn the ignition switch to the RUN position.

Do not start the engine.

Use the relay test function of the Scan Tool in order to command the Electronic Brake Control Relay on.

Does the Scan Tool indicate that the Electronic Brake Control Relay is on, and is the voltage equal to or greater than the specified voltage?

10 V

Go to Step 23

Go to Step 3

Use the J 39200 in order to measure the voltage between the Electronic Brake Control Relay connector terminal C2 and ground.

Is the voltage equal to or greater than the specified voltage?

10 V

Go to Step 4

Go to Step 9

Use the J 39200 in order to measure the voltage between the Electronic Brake Control Relay connector terminal A1 and ground.

Is the voltage equal to or greater than the specified voltage?

10 V

Go to Step 5

Go to Step 13

Turn the ignition switch to the OFF position.
Disconnect the 24-way EBCM/EBTCM connector C1.
Turn the ignition switch to the RUN position.

Do not start the engine.

Use the J 39200 in order to measure the voltage between the EBCM connector C1 terminal A11 and ground.

Is the voltage equal to or greater than the specified voltage?

10 V

Go to Step 6

Go to Step 7

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

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

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

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 17

Go to Step 8

Remove the Electronic Brake Control Relay.
Use the J 39200 in order to measure the resistance between the 24-way EBCM/EBTCM connector terminal A11 and the Electronic Brake Control Relay connector terminal C2.

Is the resistance within the specified range?

0-2 ohms

Go to Step 8

Go to Step 18

Reconnect the 24-way EBCM/EBTCM connector C1.
Reconnect the Electronic Brake Control Relay, if the Electronic Brake Control Relay is disconnected.
Turn the ignition switch to the RUN position.

Do not start the engine.

Use the Scan Tool in order to read the DTCs.

Does DTC C1216 set as current DTC?

Go to Step 22

Go to Step 23

Turn the ignition switch to the OFF position.
Remove the ABS Fuse (10A) from the fuse block.
Turn the ignition switch to the RUN position.

Do not start the engine.

Use the J 39200 in order to measure the voltage between the fuse block terminal C1 and ground.

Is the voltage equal to or greater than the specified range?

10 V

Go to Step 10

Go to Step 16

Use the J 39200 in order to measure the resistance between the ABS Fuse (10A) terminals.

Is the resistance within the specified range?

0-2 ohms

Go to Step 11

Go to Step 12

Turn the ignition switch to the OFF position.
Use the J 39200 in order to measure the resistance between the Electronic Brake Control Relay connector terminal A1 and the fuse block terminal C2.

Is the resistance within the specified range?

0-2 ohms

Go to Step 23

Go to Step 15

Turn the ignition switch to the OFF position.
Remove the 24-way EBCM/EBTCM connector C1.
Use the J 39200 in order to measure the resistance between the 24-way EBCM/EBTCM harness connector C1 terminal A9 and ground.

Is the resistance within the specified range?

OL (Infinite)

Go to Step 20

Go to Step 19

Disconnect the Electronic Brake Control Relay.
Use the J 39200 in order to measure the resistance between the Electronic Brake Control Relay terminal A1 and the Electronic Brake Control Relay terminal C2.

Is the resistance within the specified range?

0-95 ohms

Go to Step 14

Go to Step 21

Inspect the Electronic Brake Control Relay connector for the following conditions:

•

Damage