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2008 - MX-5 - Transmission/Transaxle

STEERING SHIFT SWITCH INSPECTION

1. Remove the driver-side air bag module. (See DRIVER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.)
2. Connect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].)
3. Turn the ignition switch to ON position.
4. Measure the voltage at the steering shift switch.
5. If the value are not as specified in the Terminal Voltage List (Reference), inspect the parts under “Action” and related wiring harnesses.
6. If the parts inspected under "ACTION" are found to be normal but the system still does not operate normally, replace the up or down switch according to the following conditions:

Terminal Voltage List (Reference)



Terminal

Signal

Connected to

Test condition

Voltage (V)/

Continuity

Action

C

Steering shift switch ground

GND

Under any condition: inspect for continuity to ground

Yes

  • Inspect GND

D

TNS

  • Clock spring

  • Headlight switch

Headlight switch TNS or on

B+

  • Inspect clock spring

  • Inspect headlight switch

  • Inspect related harness

Headlight switch off

Below 1.0

F

Shift change signal

  • Clock spring

  • TCM

M range

Up switch and down switch off

3.96

  • Inspect clock spring

  • Inspect TCM

  • Inspect related harness

Up switch on

1.95

Down switch on

2.48

Up switch and down switch on

1.50




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