BMW 317E — No Message: Time/Date

This fault typically produces no warning lights and no Check Control messages — ISTA confirms no driver-visible indicators for ECE or Korean markets. In practice, the driver is unlikely to notice any driveability change. The primary consequence is that DME fault log entries may lack accurate timestamps, and certain OBD readiness monitors that rely on elapsed-time calculations may not complete correctly, which can cause inspection or emissions test failures.

1. Head unit or KOMBI fault. The module responsible for broadcasting time/date (varies by platform — typically the head unit on F/G-series, KOMBI on some E-series configurations) may have an internal fault, software corruption, or may not have been coded or programmed correctly after replacement. Check the broadcasting module for stored faults.

2. CAN bus wiring issue on the body/K-CAN network. The time/date message typically originates from the infotainment or body CAN network and is gatewayed to the powertrain CAN network through the central gateway module (ZGW, BDC, or JBE depending on platform). A wiring fault on either network segment — or a faulty gateway — will prevent the message from reaching the DME.

3. Gateway module fault. On vehicles where the time/date message crosses CAN bus domains (body to powertrain), a faulty or miscoded gateway module (ZGW, JBE, or BDC) can block the message. This is especially common after gateway module replacement if the new module was not properly coded.

4. Battery voltage sag or recent battery disconnect. The time/date source module may lose its stored time after a battery disconnect and fail to broadcast valid data until the time is manually reset. In some cases a weak battery causes the source module's CAN transceiver to drop out intermittently.

5. Missing or corrupt coding in the source module. After a head unit or KOMBI replacement, if the module was not VO-coded correctly, it may not broadcast the time/date message on the expected CAN ID.

1. Full vehicle scan. Read faults from all modules. If only the DME reports this fault and no other module has CAN communication errors, the issue is likely with the time/date source module or the gateway path, not the physical CAN bus.

2. Identify the time/date source module. On E-series vehicles with CIC, the head unit typically broadcasts time/date. On F/G-series, the head unit (NBT/NBT-EVO/MGU) or KOMBI may be responsible. Check the source module for stored faults, and verify it has been coded/programmed correctly (especially if recently replaced).

3. Check the gateway module. Read faults from the ZGW, JBE, or BDC (depending on platform). Look for gateway-related communication faults that might indicate the message is being blocked in transit. If the gateway was recently replaced or updated, verify its coding includes the correct message routing tables.

4. Verify time/date is set correctly. If the vehicle's clock shows no time or a default time (00:00), the source module may not be broadcasting. Set the time manually via iDrive and clear the fault to see if it returns.

5. Measure CAN bus resistance. With battery disconnected, measure between CAN-High and CAN-Low at the DME connector and at the source module connector. Expected: 60 Ω at each measurement point if you are measuring across the full bus. Significant deviation indicates a bus wiring or termination issue.

6. Clear and monitor. After addressing the source module or gateway, clear all faults and run the vehicle with ignition on for at least 2 minutes. Re-scan to confirm 317E does not return.

If the source module (head unit or KOMBI) is not broadcasting time/date, correct its coding using the appropriate tool (E-Sys for F/G-series, NCS Expert for E-series) or reprogram it via ISTA if software is outdated. If the gateway module is blocking the message, recode or reprogram the gateway. If CAN wiring is at fault, repair the damaged section. After any module replacement, ensure VO-coding is performed so the new module broadcasts the correct CAN messages. Clear all faults after repair.