Mazda 6 Quiz
Body electrical system

Theft-deterrent control module inspection

In this manual: Body electrical system
General information — 42Engine — 23Lubrication system — 10Cooling system — 9Fuel and emission control systems — 161Engine electrical system — 17Clutch — 21Manual transaxle — 10Automatic transaxle — 110Front and rear axles — 20Steering system — 15Braking system — 104Suspension — 34Body — 201Body electrical system — 287Heater and air conditioner systems — 89Technical data — 1Special tools — 1
~1min read

1. Remove the theft-deterrent control module without disconnecting the connectors.

2. Measure the voltage at the theft-deterrent control module terminals as indicated below.

3. Disconnect the theft-deterrent control module connector before inspecting for continuity at terminals L, Q, S, T, and V.

4. If not as specified, inspect the parts listed under Action.

  • If the parts and wiring harnesses are okay but the system still does not work properly, replace the theft-deterrent control module.
Terminal Voltage Table (Reference)




W Terminal Inspection 1. Connect SST

(WDS or equivalent) to the vehicle DLC-2 16-pin connector.


2. Access and monitor RPM of PID using SST (WDS or equivalent).

  • If engine speed signal normal, go to next step.
  • If engine speed signal abnormal, inspect the ABS (ABS/TCS) HU/CM, DSC HU/CM and related wiring harness.

3. Inspect for continuity between the ABS (ABS/TCS) HU/CM terminal X and the theft-deterrent control module terminal W, or DSC HU/CM terminal AB and the theft-deterrent control module terminal W using an ohmmeter.

  • If not continuity, replace the related wiring harness.
  • If wiring harness is normal, replace the theft-deterrent control.

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A quick Mazda 6 quiz: every answer comes with an explanation and a link to the manual page.