Antilock Braking System (ABS)

ABS Schematic: Code 16:

ENABLE RELAY COIL CIRCUIT OPEN
The ABS control module receives battery voltage when the system enable relay contacts are closed. Voltage at this input provides the power source for the three DC motors and two solenoids. If the ABS control module detects a fault in this circuit, it will disable ABS operation and turn On the antilock telltale.

CODE PARAMETERS
Code 16 sets if:
^ Enable relay coil circuit is open.
^ Code 86 could also be set and the brake telltale will light if the rear motor is not in home position.
^ This code can set at key-up. It will not set during ABS braking or after a previous test has disabled ABS.
^ If conditions necessary for this code to set occur during ABS braking, it will set code 14.

Diagnostic Chart: Code 16:

DIAGNOSTIC AIDS
When Attempting To Diagnose - an intermittent problem, use the scan tool to review supplemental diagnostic information. The supplemental data can be used to duplicate a problem.
^ Select Malf History from Scan tool ABS menu.

Intermittents Or Opens - suspected to be at the connectors can be detected by using a diagnostic service probe. Voltage can be read on wires without disconnecting any connectors.
^ Check the tightness of the female terminal grip with a spare male terminal.