Step 2: Check The Input Signal (By Using The Pulse Check)
Check the input signals from the following switches:
- Key reminder switch.
- Hazard warning light switch.
CAUTION:
To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
- Connect scan tool MB991502 to the data link connector.
- If the switches are operated, check if scan tool MB991502 sounds or not. See Fig 1.
When the key reminder switch and the hazard warning light switch are operated, does scan tool MB991502 sound in each case?
- YES
Replace the ETACS-ECU. Check that the encrypted code can be registered in the transmitter. - NO
Scan tool MB991502 does not sound when the ignition key is removed and reinserted: See INSPECTION PROCEDURE M-1: ETACS-ECU DOES NOT RECEIVE A SIGNAL FROM THE KEY REMINDER SWITCH .Scan tool MB991502 does not sound when the hazard warning light switch is turned from "OFF" to "ON.": See INSPECTION PROCEDURE M-2: THE ETACS-ECU DOES NOT RECEIVE ANY SIGNAL FROM THE HAZARD WARNING LIGHT SWITCH .