Bulb Check

When the starter switch is turned on, the TOD indicator lamps go on as shown below.

NOTE: Once the starter switch is turned on, all the TOD indicator lamps are lit for two seconds even if the TOD switch is in any position.

Fig 1: TOD Indicator Lamp Signal While Starter Switch Turned On

Courtesy of ISUZU MOTOR CO.

Simplified checking method of ABS IN and BRAKE ON signals:

In the event that any of the signal inputs listed below are observed while the self-diagnostic code is being displayed (the self-diagnostic connector is short-circuited to GND), you can simply check the ABS IN and BRAKE ON signals as shown in the figures below.

Fig 2: Checking Method Of ABS IN & BRAKE ON Signals

Courtesy of ISUZU MOTOR CO.