Pinpoint Test 5: The Low Beams Are Always On

PINPOINT TEST 5: THE LOW BEAMS ARE ALWAYS ON

Refer to the Tribute Wiring Diagrams for schematic and connector information.

Normal Operation

The Smart Junction Box (SJB) sends reference signals to the headlamp switch through circuits (W/V) (off), (L/GY) (parking lamps) and (Y/L) (headlamps). At any given time, the headlight switch routes one of the input circuits to ground through circuit (B/L).When the SJB detects the headlamp switch in the HEADLAMPS ON position with the multifunction switch in the LOW BEAM position, the SJB provides voltage through circuits (BR/L) and (L/G) to the LH and RH low beam headlamp, respectively.

- DTC B1472 (Lamp Headlamp Input Circuit Short to Ground) - an on-demand DTC that sets when the SJB detects the headlamps on input circuit is short to ground.
- DTC B2498 (Headlamp Switch Multiple Signals Input Active) - an continuous DTC that may set when the SJB detects multiple headlamp switch inputs active at the same time.
- DTC B2A22 (Headlamp Off Circuit Open) - an on-demand DTC that sets when the SJB detects the headlamp switch off input circuit open.
- DTC B2A2E (Right Front Lamp Low Beam Circuit Open) - an on-demand DTC that sets when the SJB detects the RH low beam output circuit shorted to voltage.
- DTC B2A30 (Left Front Lamp Low Beam Circuit Open) - an on-demand DTC that sets when the SJB detects the LH low beam output circuit shorted to voltage.

Possible Causes
- Wiring, terminals or connectors
- Headlamp switch
- SJB

Diagnostic Procedure

CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:Failure to disconnect the battery when instructed will result in false resistance readings. See Battery Disconnect.