Bendix Commercial Vehicle Systems TABS-6 TRAILER ABS MODULE - Manual (Page 9)

9
PARTIAL ABS SHUTDOWN
Depending on the trouble code detected, the ABS ECU
partly or completely disables the ABS functionality.
The trailer ABS system, for vehicles that only have one
modulator, are disabled by any single fault. In the case of
vehicles with two or three modulators, depending on the
trouble code, the trailer ABS system may still provide some
level of ABS function on axles/wheels that are not affected
by the fault, but the ABS indicator lamp will remain on. In
cases where the ABS is completely disabled, the vehicle
reverts to normal braking (without ABS interventions).
Always repair ABS shutdowns at the earliest opportunity.
ECU Diagnostic Trouble Codes
All ABS functions are completely disabled. The system
reverts to normal braking.
Voltage Diagnostic Trouble Code
While voltage is out of range, the ABS functionality is
disabled and the system reverts to normal braking. When
the correct voltage level is restored, full ABS is typically
available again. The operating voltage range is 8.0 to
16.0 VDC.
BLINK CODE DIAGNOSTICS
The TABS-6 module provides diagnostic and confi guration
functions through blink code diagnostics. This means that
the technician, even without diagnostic tools, can read a
series of ABS indicator lamp blinks to diagnose the trouble
codes being generated.
The blink code diagnostics mode is entered by providing
constant power to the ignition circuit and toggling the
brake light power input three times. With a parked towing
vehicle attached, this is done by applying ignition power
and after the power up sequence is complete, depressing
and releasing the brake pedal three or more times, see
chart 5 below.
Depending on the blink code mode activated, the TABS-6
module will blink the trailer-mounted ABS indicator
lamp to display: active fault codes; fault code history;
ABS confi gurations; and odometer mileage. Blink code
diagnostics can also be used to reset active fault codes.
Wait until after the modulator chuff test before activating
the brake light power. Following a single display of all
available messages, the ABS indicator lamp will remain on
for fi ve seconds and then return to normal operating mode.
Blink code diagnostics can only be activated following a
power-up, where wheel speeds have not been detected. If
the vehicle moves during blink code diagnostics mode, the
module will cancel the blink code diagnostics and return to
normal operating mode.
Blink code diagnostics must be activated within the fi rst 15
seconds of ignition power being applied.
If brake light power is continuously applied for greater than
fi ve seconds, blink code diagnostics will be disabled until
the next time the ignition power is cycled.
Display Active Diagnostic Trouble Codes
To display active codes, apply ignition power and depress
/ release the brake pedal 3 times within 15 seconds.
Following activation, there will be a 5-second delay followed
by a blink code display of all active fault codes. (See pages
10-12 for more information.)
Display Diagnostic Trouble Code History
To display trouble code history, apply ignition power
and depress / release the brake pedal 4 times within 15
seconds. Following activation, there will be a 5-second
delay followed by a blink code display of all history fault
codes. (See pages 10-12 for more information.)
Reset Active Diagnostic Trouble Codes
To reset active codes, apply ignition power and depress
/ release the brake pedal 5 times within 15 seconds.
Following activation, there will be a 5-second delay followed
by a blink code message of:
1-1, (System Fully Operational - No Codes Detected) or a
blink code display of all remaining active fault codes.
The ABS indicator lamp will stay on if active DTCs are still
present.
Resetting active fault codes with blink code diagnostics
does not clear information from trouble code history. Both
blink code diagnostics or diagnostic tools can retrieve
trouble code history, but only diagnostic tools can erase
this information.
CHART 5 – BLINK CODE INFORMATION
With Ignition Power Blink Code
Applied, Cycle Brake Action
Light Power
3 times Display Active DTCs
4 times Display Inactive DTCs
5 times Clear Active DTCs
6 times Display Confi guration
7 times Display Odometer Mileage
8 times Reset Confi guration