Page 38 ASE TrAnSiT BuS STudy GuidE
H6 TASk LiST (cOnTinuEd)
D. Lighting Systems Diagnosis and Repair (7 questions)
1. Diagnose the cause of brighter than normal, intermittent, dim, or no headlight and
daytime running light (DRL) operation.
2. Test, aim, and replace headlights.
3. Test headlight and dimmer switches, wires, connectors, terminals, sockets, relays, and
control components; repair or replace as required.
4. Inspect, test, and repair parking, clearance, and taillight circuit switches, bulbs,
sockets, connectors, terminals, relays, wires, and light-emitting diodes (LEDs);
replace as required.
5. Inspect, test, and repair dash light circuit switches, bulbs, sockets, connectors,
terminals, wires, and printed circuits; replace as required.
6. Inspect, test, and repair interior and exterior passenger light circuit switches, bulbs,
sockets, connectors, terminals, ballasts/inverters, and wires; replace as required.
7. Inspect and test stoplight circuit switches, bulbs, light-emitting diodes
(LEDs),sockets, connectors, terminals, relays, control components, and wires; repair
or replace as required.
8. Diagnose the cause of turn signal and hazard light system malfunctions; determine
needed repairs.
9. Inspect and test turn signal and hazard circuit ashers or other control components,
switches, bulbs, sockets, connectors, terminals, relays, wires, and light-emitting
diodes (LEDs); repair or replace as required.
10. Inspect and test backup light and warning devices, circuit switches, bulbs,
light-emitting diodes (LEDs), sockets, connectors, terminals, and wires; repair
or replace as required.
11. Differentiate between electrical, or multiplex problems that cause lighting system
malfunctions.
E. Related Vehicle Systems Diagnosis and Repair (8 questions)
1. Diagnose the cause of intermittent, high, low, or no gauge readings; determine
needed repairs.
2. Diagnose the cause of control area network (CAN) driven gauge malfunctions;
determine needed repairs.
3. Inspect, test, and adjust gauge circuit sending units, sensors, gauges, connectors,
terminals, and wires; repair or replace as required.
4. Inspect and test warning device (lights and audible) circuit sending units, sensors,
bulbs, audible components, sockets, connectors, terminals, wires, and printed
circuits/control modules; repair or replace as required.
5. Inspect and test electronic speedometer and odometer systems; replace as required;
verify proper calibration for vehicle application.
6. Inspect and test horns, horn circuit relays, switches, connectors, terminals, and wires;
repair or replace as required.
7. Diagnose the cause of constant, intermittent, or no wiper operation; diagnose the
cause of wiper speed control and/or park problems.
8. Inspect and test wiper motor, resistors, park switch, relays, switches, connectors,
terminals, and wires; repair or replace as required.