Section 5
Diagnostics
Page 22
Using the Blink Code
For ECU Part Number 472 500 011 0 without
diagnostic connector:
1. Make sure the vehicle is stationary:
앫 Emergency brake ON
앫 Wheels properly chocked
2. Provide 12 volts DC power (9.5 to 14 volts is
acceptable range) to the ECU/Valve Assembly.
3. Check the ABS warning lamp on the trailer. If:
앫 The warning lamp comes ON briefly, then
goes OFF: There is no fault in system.
앫 The warning lamp comes ON and stays ON:
There is an existing fault. Go to Step 4.
4. Check the blink code lamp on the ECU. See
Figure 5.1 .
앫 If blink code lamp is OFF, there is no
system fault.
앫 If the blink code lamp is flashing, count the
number of flashes to identify the fault. Check
Table D — ECU Part Number 472 500 011 0
Blink Codes to determine the problem.
Follow the suggested corrective action.
Table D — ECU Part Number 472 500 011 0 Blink Codes
Figure 5.1
1 Blink Code Lamp
Blink Code Problem Area Action
4 Sensor YE1 (curbside sensor) Check sensor installation and connections.
Verify proper sensor resistance and air gap.
Make necessary repairs.
6 Sensor YE2 (roadside sensor) Check sensor installation and connections.
Verify proper sensor resistance and air gap.
Make necessary repairs.
10 ECU/Valve Assembly Verify proper installation. Make sure all connections
are secure.
If code continues, contact WABCO for assistance.
14 Power Supply Verify proper electrical installation and connections.
Check power supply.
Make necessary corrections.
15 ECU Failure Verify proper installation.
If code continues, contact WABCO for assistance.
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