ABS Light: Description and Operation

ABS Indicator
1. If the system is OK, the ASS indicator comes on for two seconds (initial turn on) after turning the ignition switch ON (II), then the ABS indicator goes off. After that time, the ABS indicator comes on again after starting the engine, then the ABS indicator goes off two seconds after the ignition switch return to ON (II). This occurs because the ABS control unit activates by the power source circuit that is connected only when the ignition switch is ON (II).
2. If a problem occurs, the Central Processing Unit (CPU) diagnoses the problem area and the problem condition, then the CPU memorizes the Diagnostic Trouble Code (DTC) and turns on the ABS indicator. If the system is OK, the ABS indicator does not come on except when the ignition switch is initially turned on.
3. If the problem is detected intermittently or continuously, the ABS indicator indication pattern is different as described below.
- DTC 61 or 62:
The ABS indicator comes on when a problem is detected in every time the system is activated, and the ABS indicator goes off when the system returns to normal.
- DTC 11, 13, 15, 17, 31, 32, 33, 34, 35, 36, 37, 38, 54, 71 or 81:
The ABS indicator comes on when a problem is detected in every time the system is activated, and the ABS indicator continues on until the ignition switch is turned OFF regardless of the system returns to normal or not.
- DTC 12, 14, 16, 18, 21, 22, 23, 24, 41, 42, 43, 44, 51, 52 or 53:
The ABS indicator comes on when a problem is detected, and the ABS indicator continues on until the ignition switch is turned OFF. The ABS indicator goes off when the system is activated the next time.
4. The ABS indicator comes on when the ABS control unit detects a problem in the system. However, even though the system is operating properly, the ABS indicator will come on, under the following conditions. To determine the actual cause of problem, question the customer about the problem, taking these conditions into consideration.
- Only drive wheel (or wheels) rotate
- One drive wheel is stuck
- Vehicle spin
- ASS continuous operate for a long time
- Signal disturbance