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Retrieving Codes

NOTE: Perform appropriate FUNCTIONAL TEST chart under TROUBLE SHOOTING CHARTS .
  1. Vehicles with VCM and 16-pin DLC DO NOT  have the capability to flash trouble codes. A Tech 1 or other scan tester is necessary to retrieve codes.
  2. Turn ignition off. Connect Tech 1 to DLC. Access 4WAL brake trouble codes using Tech 1. Repair trouble codes in order they appear. See 4WAL FAULT CODE DIRECTORY  for diagnosis. If no fault codes are present, see the 4WAL SYMPTOM DIAGNOSIS DIRECTORY .
Fig 1: Identifying DLC Terminals
G95E27114Courtesy of GENERAL MOTORS CORP.
4WAL SYMPTOM DIAGNOSIS DIRECTORY

Symptom Go To
ANTI-LOCK Light Off Figure
ANTI-LOCK Light On Figure
Brake Pedal Pulses (1) Figure
Wheel Pull During Hard Braking (1) Figure
(1) These conditions must exist with no fault codes stored
4WAL FAULT CODE DIRECTORY

Diagnostic Trouble Code Go To Figure:
21 Or 25 Figure
22 Or 26 Figure
23 Or 27 Figure
29 Figure
36 Figure
37 Figure
38 Figure
41, 45 or 51 Figure
42, 46 Or 52 Figure
43, 47 Or 53 Figure
44, 48 Or 54 Figure
64 Or 69 Figure
65 Figure
66 Figure
67 Figure
68 Figure
74 Figure
75 Figure
81 Figure
86 Figure