DTC B1311-87: Clock Module - Missing message: Action

NOTE: This DTC may be set even though no fault condition is present and should be ignored unless the customer has reported an analogue clock concern. Clear the DTCs and retest. Verify the customer concern prior to diagnosis

Refer to the electrical circuit diagrams to locate the fused supply circuit to the clock. With the ignition supply in the off state, remove and reinstall the fuse
Refer to the electrical circuit diagrams and check the LIN circuit - Circuit reference LIN 1 - Between the clock and the body control module
If fault persists, check and install a new clock as required