Mazda MX-5 NA silhouetteMX-5 NA

LIGHTING SYSTEM

T-80prose procedure

Symptom: Daytime running lights (DRL) function does not cancel.

Step 1

  1. 1
    Turn on the ignition switch ON.
    Three-quarter front-left illustration of the MX-5 vehicle, used as the visual reference for Step 1 (verifying DRL cancellation by operating various switches).
    05U0TX-162
  2. 2
    Verify the symptom by operating the following switches; the DRL should cancel. Go to the specified Step. - Headlight switch. - Hazard warning switch. - Turn signal switch. - Parking brake switch (lever pulled one notch).

Symptom matrix

Headlight switch ON
Next StepStep 2
Hazard warning switch ON
Next StepStep 4
Turn signal switch ON
Next StepStep 4
Parking brake switch ON
Next StepStep 5

Step 2

  1. 1
    Turn on the ignition switch.
    DRL unit connector with pin layout: top row (G/Y)(B)(W/R)(L/Y); bottom row (L)(W)(G/B)(G/O)(R). A test lead/voltmeter is shown checking the W/R terminal.
    05U0TX-164
  2. 2
    Turn on the headlight switch.
  3. 3
    Check the voltage at the terminal-wire (W/R) of the DRL unit connector.
  4. 4
    If not as specified, go to Step 3.
  5. 5
    If correct, replace the DRL unit.

DRL unit terminal voltage (Step 2)

(W/R)
Voltage12V

Step 3

  1. 1
    Remove the column cover and disconnect the connectors of the headlight switch.
    Headlight switch column-mounted connector viewed from the wiring side, with terminals labelled BTN, BA, HO, HB, HU and TNS arranged around the connector body.
    05U0TX-165
  2. 2
    Check continuity between the terminals of the headlight switch connector.
  3. 3
    If not as specified, replace the headlight switch.
  4. 4
    If correct repair wire (W/R). (Headlight switch — DRL unit)

Headlight switch continuity (Step 3)

Headlight switch ON
Terminal BTNO
Terminal TNSO
Headlight switch OFF
Terminal BTN
Terminal TNS
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