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Truck And Trailer ABS Flash Codes

May 31st, 2012

KNOW YOUR DIFFERENT ABS FLASH CODES FOR DIFFERENT MAKES OF SYSTEM

There are always two, possibly three, ways to power up the ABS system and you should know what to expect regarding light function. If an ABS/EBS cable is fitted then the GREEN headboard monitor lamp should be ignored and only look at the in-cab RED dashboard light. (The trailer light may not work at all with the ISO7638 connected)

STATIONARY TRAILER HEAD BOARD LAMP FUNCTION WHEN POWERED ONLY BY 24N STOP LIGHTS (REMOVE ALL OTHER CABLES)

ABS ECU

MAKE & MODEL

STOPLIGHT POWER UP LAMP

LAMP AFTER 2 SECONDS

LAMP AFTER 4 SECONDS

DOWN ROAD <10KPH LAMP <10 KPH FAULTY IF LAMP
HALDEX/GRAU MGX 1 & 2

ON

OFF

OFF

OFF

ON

HALDEX/GRAU

MGX 2E

ON

ON

ON

OFF

ON

HALDEX/GRAU

MGX 100

ON

OFF

ON

OFF

ON

HALDEX/GRAU

MODAL

ON

OFF

ON

OFF

ON

HALDEX/GRAU

MODULAR 1/1+/2

ON

OFF

ON

OFF

ON

WABCO VARIO C BOXER

ON

ON

ON

OFF

ON

WABCO

VCS 2S/2M

ON

ON

ON

OFF

ON

BENDIX/KNORR

AL4T

ON

OFF

OFF

OFF

ON

KNORR-BREMSE

KB A18

ON

OFF

OFF

OFF

     ON**

KNORR-BREMSE EBS TEBS 4

ON

ON

ON

OFF

ON

 

The in-cab dashboard warning light will only work when the ABS Susie (ISO7638) or, in some cases, the 24S is connected. The lamp sequence will mimic the trailer headboard warning lamp when the ignition is turned on (NOTE: NO NEED TO PRESS FOOT BRAKE PEDAL)

** The first time after fitting a new ECU, this sequence is different until the vehicle has been driven above 30kph and the brought to a halt for dynamic sensor check. After this it should function as shown in table.

·         24Normal – ISO 1185

·         24 Supplementary – ISO3731

·         ABS/EBS – ISO7638

aide automotive ltd offer trailer light testers and ABS / EBS sensor testers for truck and trailer diagnostic repairs.

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