Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

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Shift Interlock Control Module: Testing and Inspection





CONTROL UNIT INPUT TEST





Disconnect the 8-P connector from the control unit. Make the following input tests at the connector terminals. If all tests prove OK. yet the system fails to work, substitute the control unt with a known good one. If the system is OK, replace the control unit.








NOTE: If the shift lock solenoid clicks when the ignition switch is ON and the brake pedal is pushed (the shift lever is in the P position), the shift lock system is electronically normal.