1. Fault Overview
When the MSB Fault Light DOES NOT illuminate while the ignition is turned ON, and:
LED Displays only the ‘P’ LED flashing at 5Hz (5 flashes per second), alongside a beep every 30 seconds from the LED module’s buzzer.
OR
When the LCD screen logs a GPS fault, “G: no lock”.
The fault conditions will be one of below:
Conditions for setting fault
- Faulty GPS antenna.
- Internal MSB ECU fault
NOTE: A GPS fault is logged when the system has not obtained a GPS LOCK for five ignition cycles, with a minimum of five minutes between cycles.
Inside the MAX-SAFE ECU housing there are two LED lights, located adjacent to the two blue potentiometers. If these LEDs are flashing, the system has not obtained GPS LOCK.
DO NOT MAKE ANY ADJUSTMENTS INSIDE MSB ECU.
After completing diagnosis and rectifying any faults, a full system test must then be performed and documented on the Systems Confirmation Test – MAX-SAFE Anti-Rollaway Brake System test sheet prior to returning the vehicle to service.
STEP 1: Locate MSB module. Verify GPS antenna connected and tight to MSB ECU.
Inspect the GPS aerial mounting position, ensuring that it has a clear view of the sky through the windscreen. Inspect the aerial itself/cable for any damage.
Within specifications: Replace faulty GPS antenna.
Not within specifications: Replace damaged GPS antenna.
STEP 2: Clear the fault by isolating the vehicle power supply at the batteries for at least 1 second, then re-connect the power supply to the vehicle.
After disconnecting and re-connecting the battery, allow up to 3 minutes before continuing with the Diagnostic Process, to allow for GPS LOCK to be achieved.
Within specifications: Verify repair with Full System Test.
Not within specifications: Continue to STEP 3.
STEP 3: With the power disconnected remove the PCB from the MAX-SAFE ECU housing. Reconnect power to MSB ECU and GPS connector. Verify the GPS LOCK LEDs (Allow up to 3 minutes to achieve GPS lock after initial power up of system).
LED’s Flashing: No GPS lock.
LED’s Solid. GPS lock achieved.
If the LEDs are still flashing, the MSB ECU has failed. Replace MSB ECU and verify repair with Full System Test.
3. Full System Test
Undertake a full system test of the MAX-SAFE Brake System and document the results on the test sheet found within the document Systems Confirmation Test – MAX-SAFE Anti-Rollaway Brake System prior to returning the vehicle to service.
Should the testing outlined within the Systems Confirmation Test fail for any reason, the system must be thoroughly inspected, diagnosed and repaired, as per the relevant Diagnostic Process document, prior to the vehicle being returned to service.
Was this article helpful?
That’s Great!
Thank you for your feedback
Sorry! We couldn't be helpful
Thank you for your feedback
Feedback sent
We appreciate your effort and will try to fix the article