STEERING SHIFT SWITCH INSPECTION

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.

When inspecting terminal C for continuity, disconnect the steering shift switch connector.

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:

The voltage is normal when the up switch is on and is abnormal when the down switch is on: Replace the down switch.

The voltage is normal when the down switch is on and is abnormal when the up switch is on: Replace the up switch.

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
D	TNS	Clock spring Headlight switch	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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