Diagnostic Procedure with Cancel Code: 16

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.

Detected when ignition switch is turned to OFF or malfunction related to the ignition switch occurs.

Trouble symptom:

Cruise control cannot be set.

Wiring diagram:

Cruise control system Ref. to WIRING SYSTEM>CRUISE CONTROL SYSTEM>WIRING DIAGRAM

Courtesy of SUBARU OF AMERICA, INC.

CAUTION:

Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to CRUISE CONTROL (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION

CHECK IGNITION SWITCH CIRCUIT .
1. Turn the ignition switch to OFF.
2. Disconnect the ECM connector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DOTC)>ENGINE CONTROL MODULE (ECM)
3. Turn the ignition switch to ON.
4. Measure the voltage between ECM connector and chassis ground.
  Connector & terminal
  
  (B61) No. 54 (+) - Chassis ground (-):
Is the voltage 10 V or more?

Yes : Check for poor contact of ECM connector.

No :
- Check the fuse No. 7 (main fuse box). Ref. to WIRING SYSTEM>CRUISE CONTROL SYSTEM>WIRING DIAGRAM
- Check the harness for open or short circuit between ignition switch and ECM.