Ignition System: Description and Operation

General Notes On Ignition System

- For the electric components to work properly, a voltage of at least 12.7 V is required.
- It is possible that the control module will recognize a malfunction and store a DTC during some tests. After completing all tests and repairs, DTC memory should therefore be checked and erased if necessary. Readiness code must be generated after DTC memory is erased.
- If the engine only starts briefly and then turns off again after troubleshooting, repair or checking of the components, it may be that the immobilizer is blocking the Engine Control Module (ECM). DTC memory must then be checked and if necessary, control module must be adapted.

CAUTION:
- For vehicles with Telematics, activate service mode of Telematics Control Module before disconnecting the battery.
- The battery must only be disconnected and connected with the ignition switched off, since the Engine Control Module (ECM) can otherwise be damaged.
- Note radio code (for vehicles equipped with coded anti-theft radio / radio navigation system), obtain if necessary.
- Disconnect Ground (GND) wire at battery Ground (GND) terminal with the ignition switched off.

NOTE:
- Be sure to activate vehicle features (radio/radio navigation system, clock, electric window regulators) according to owner's manual when the battery is re-connected.
- Deactivate service mode of Telematics Control Module.
- Generate readiness code.