Service Data Check

SERVICE DATA CHECK

1. Use the scan tool MB991958 (M.U.T.-III Sub Assembly) and the SWS monitor kit to check "Data List" or "Function Diag.". This "Data List" or "Function Diag." check is applicable for signals, which are transmitted and received through the SWS communication line. For input signals, which are not compatible with the SWS monitor kit, refer to the Pulse Check procedure (by using the scan tool or voltmeter) Pulse Check.
2. The following input signals can be checked by using the scan tool MB991958 (M.U.T.-III Sub Assembly) and the SWS monitor kit.
NOTE:
If a problem is found in the "Service Data" check, refer to Input Signal Chart Input Signal Chart.

[DATA LIST REFERENCE TABLE]

The table below shows the service data and their normal condition, which are displayed during the "Data List."

COLUMN-ECU





ETACS





NOTE:
For item No.43, the scan tool MB991958 (M.U.T.-III Sub Assembly) also displays "ON" when the light reminder tone alarm or the seat belt tone alarm function is triggered.

Front-ECU, Power window, Sunroof





NOTE:
For item No.70, the scan tool MB991958 (M.U.T.-III Sub Assembly) also displays "NG" under "ECU COMM Check" when it displays "NO ACK" under the front-ECU check.

NOTE:
For item No.72, the scan tool MB991958 (M.U.T.-III Sub Assembly) also displays "NG" under "ECU COMM Check" when it displays "NO ACK" under the sunroof-ECU check.

[FUNCTION DIAGNOSIS]

The table below shows the service data and their normal condition, which are displayed during the "Function Diag." The column "Normal condition" shows values that are shown when each operation is made.

WIPER









REAR WIPER





LIGHTING





NOTE:
When checking the input signals (off, tail, low-beam or high-beam), turn the ignition switch to the "ON" position in order to disable the headlight automatic shutoff function. However, since the headlight operation does not depend on the ignition switch positions, the scan tool MB991958 (M.U.T.-III Sub Assembly) does not display the title "IGNITION SWITCH".
For checking item "HEADLIGHT HI", the scan tool MB991958 (M.U.T.-III Sub Assembly) displays "OFF" on the item No.2 "DIMMER SW" when the headlights are at high-beam. Therefore, the scan tool MB991958 (M.U.T.-III Sub Assembly) should display "ON" momentarily when the dimmer switch is operated.

TURN SIGNAL





BUZZER





NOTE:
The headlight automatic shutoff function operates approximately one second after the lighting monitor tone alarm starts sounding, and then the tone alarm ceases sounding.

SUNROOF