NHTSA ID Number: 10154586
Manufacturer Communication Number: PIT5058E
TSB/Document Date: 2019-03-18
Summary
This Preliminary Information communication provides information to the technician about the operation and diagnostics of the Regular Production Option Code UJ1 brake warning pressure warning system. The technician can test the operation of the brake warning system. If the warning system does not function correctly, technician will need to inspect circuit 33 for a short to ground between X141 and the Instrument Panel Cluster terminal 14. Then inspect check circuit 33 for an open between X141 and the Instrument Panel Cluster terminal 14. Also technician should check male side of X141 circuit 33 with an ohm meter to ground and should be close to 0 ohms with engine off and key on. Start engine and circuit should go (OL) indicating that the flow switch opened. Then, turn the steering to the stop in pressure relief and verify that the circuit stays (OL) to check the operation of the pressure switch.
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- Mixes well with conventional fluids
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- Ideal for hydraulic and disc brakes
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TSB/Document ID: PIT5058E
Replacement Service Bulletin Number:
MFR Communication Date: 2018-12-13
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SERVICE BRAKES
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Bulletin No.: PIT5058E
Published date: 12/13/2018
Preliminary Information
PIT5058E Diagnostic Tip - School Bus Brake Warning System RPO
UJ1 Functional Test and Diagnostics
Models
Brand:
Model:
Model Years:
VIN:
from
to
Engine:
Transmissions:
Express Cutaway
or Cargo Chassis
2008 - 2019
All
All
All
All
Savana Cutaway or Cargo Chassis
2008 - 2019
All
All
All
All
With RPO UJ1
Supersession Statement:
This PI was superseded to add Model Years. Please discard PIT5058D.
Condition / Concern
Some dealers may need information on the operation and diagnostics of the UJ1 brake
warning pressure warning system.
Recommendations / Instructions
To test for the proper function and operation of the UJ1 brake warning system:
1. Turn key to on position (Do not start engine) Park brake not applied.
2. Wait approximately 2 seconds.
3. Brake symbol will come on and chime will sound.
4. Start engine, light should go out and chime should stop.
If the warning system does not function correctly, then follow the below diagnostics:
1. Disconnect X141 (left rear of the engine compartment near the cowl) and the brake light and chime should be
o . If the light and chime are still on then check circuit 33 for a short to ground between X141 and the IPC
terminal 14.
2. Ground terminal A on the female side with the engine on and park brake released and the brake light and
chime should come on. If the light and chime does not come on then check circuit 33 for an open between X141
and the IPC terminal 14.
3. Check male side of X141 circuit 33 with an ohm meter to ground and should be close to 0 ohms with engine o
and key on. Start engine and circuit should go OL indicating that the ow switch opened. Then, turn the steering
to the stop in pressure relief (do not hold for more than 5 seconds)
and verify that the circuit stays OL to check the operation of the pressure switch.
Warranty Information
The correction for this concern may be one of several repairs described in the diagnostic tips
above. For vehicles repaired under warranty, please use the appropriate warranty labor
operation based on the actual cause and repair.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is
resolved without completing every step, the remaining steps do not need to be performed.
© 2019 General Motors. All Rights Reserved.
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