Truck And Trailer ABS Flash Codes
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.