Table A: Lamp Does Not Come on at Ignition Switch on

CIRCUIT DESCRIPTION
Operation (ON /OFF) of the "ABS" warning lamp is controlled by the ABS control module and the fail-safe relay. When the ignition switch is turned ON, the ABS control module switches the contact point of the fail-safe relay from the lamp circuit side (relay OFF) to the hydraulic unit circuit side (relay ON). (Immediately after the ignition switch was turned ON, however, the relay is switched from OFF in the order of ON -> OFF -> ON as the initial check of the fail-safe relay.)
If the Antilock brake system is in good condition, the ABS control module turns the "ABS" warning lamp ON at the ignition switch ON, keeps it ON for 2 seconds only and then turns it OFF If an abnormality in the system is detected, the lamp is turned ON by both ABS control module and fail-safe relay.
Also, it is turned ON by the fail-safe relay when the connector of the ABS control module was disconnected.
When the lamp drive circuit E23-19 of the ABS control module becomes open, the lamp flashes twice and turns OFF as the initial check of the relay.
The lamp is turned ON when the ABS control module is in the mode to clear the diagnostic trouble code (the diag. switch terminal and the diag. output terminal are connected or when the "V circuit and "Gr/R"circuit are shorted).

Steps 1-4:

INSPECTION