1. Disconnect the negative battery cable..
2. Remove the front under cover No.2..
3. Remove the back-up light switch..
4. Verify that the continuity between the back-up light switch terminals is as indicated in the table.


If not as indicated in the table, replace the back-up light switch.
Auto Light Sensor
Back Up Light Switch Removal/Installation [C66 M R]Cruise Control Switch Inspection
1. Disconnect the negative battery cable and wait for 1 min or more..
2. Remove the driver?side air bag module..
3. Disconnect the clock spring connector (part wiring harness-side).
4. Measure the resistance between clock spring terminals E and A (part wiring
harness-side) using a tester.
...
Negative Battery Cable Disconnection/Connection [Skyactiv G 2.0]
WARNING:
Before removing the SRS air bag system-related parts, always disconnect the
negative battery cable and wait for 1 min. or more to allow the back-up power
supply to deplete its stored power..
Required procedure after negative battery cable disconnection/connection
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Seat Warmer Control Unit Removal/Installation
WARNING:
Handling a side air bag improperly can accidentally operate (deploy) the
air bag, which may seriously injure you. Read the service warnings/cautions
in the Workshop Manual before handling the front seat (side air bag integrated)..
1. Switch the ignition off (LOCK).
2. ...