Equus 3123 - GM Code Reader (1982 - 1995) - Manual (Page 31)

Retrieving ABS Codes
GM 3-6
• Code 21 looks like:
NOTE: Service codes will repeat as long as Code Reader is
connected.
6. Turn off ignition and remove the Code Reader.
3.3.4 Retrieving Service Codes for Bosch 2S and 2U Systems
1. Turn off ignition.
2. Connect the Code Reader to the vehicle test connector.
NOTE: The Code Reader only fits into the connector one way.
3. Set Selector Switch to ABS A-H
position.
4. Turn on ignition. DO NOT
START THE ENGINE.
5. Read codes from the "Service ABS" or "Anti-Lock" light on
your vehicle's instrument panel. Be sure to write the codes
down.
NOTE: If the light does not blink, refer to your vehicle's
service manual for information on checking the
circuitry.
• All codes are two digits.
• Count blinks to get the service codes:
• First and second digits of code are separated by a pause.
• Code sequence will start with Code 12:
NOTE: Code 12 is not a fault code. Code 12 indicates the
self-diagnostic system is functioning properly
(system pass).
• Each code is repeated three times. After all codes have
been displayed, the entire code sequence is repeated.
NOTE: Service codes will repeat as long as Code Reader is
connected.
6. Turn off ignition and remove the Code Reader.
BLINK
PAUSE
= Code 21
BLINK BLINK
BLINK
PAUSE
= Code 12
BLINK BLINK