U-ABS 24N to Power-B

Find here extended description, connector views, and help for diagnostic as well !

Description

  • Connects to ISO1185 (No longer approved for ADR installation) :
    • White wire to Pin 1
    • Red wire to Pin 4
    • Black wire to trailer ABS warning lamp
  • Connects to ISO12098 (ADR approved) :
    • White wire to pin 4
    • Red wire to Pin 7
    • Black wire to trailer ABS warning lamp
  • Conforms to IP67 when mated with U-ABS ECU
  • Cable insulation material : PVC

Power-B plug

U-ABS Power-B plug ok.png

Pin Description Color Section (mm2)
1 B+ Red 1.5
2

Lamp

Black 1.5
3 B- White 1.5

Diagnostic

Power-B is an optionnal back-up power in EU. But in some countries, it is the main powering of U-ABS (i.e. Brazil).

When switching power ON, with trailer brakes applied, vehicle at rest

  • Each modulator exhausts one time (the number of exhaust must be the same as the number of modulators).
  • ABS warning lamp on dashboard or trailer indicates a specific sequence (ON/OFF) or (ON/OFF/ON)

If not, check power supply :

Test points

(with 21W lamp)

Condition Required value Mesured value Comments

Power-B plug

1 - 3

 

ISO1185 connected

Stop lamps ON

B+  

If mesured value is below B+ (voltage drop), it can indicate a resistance in the wiring.

Next steps :

  • check for oxidation marks in the 24N connector
  • check stop light signal in the connection box
  • check the continuity of the wires with ohmmeter between connection box and ECU plug. (R<5Ω for correct operation)

Power-B plug

1 - 3

ISO1185 connected

Stop lamps OFF

0V

 

A permanent power indicates a wrong wiring or short circuit.

Next steps :

  • check for oxidation marks in the 24N connector
  • check the wire position in the connection box
  • check isolation between wires with ohmmeter