Defect Code 59

Defect Code 59:

Diagnosis not possible with EKM:

Note: Observe notes in the BMW DIAGNOSTIC SYSTEM (screen display).

Troubleshooting:

- Check fuses for terminal 30, 15 and R for EKM and renew if necessary.

- Is a voltage of approx. 12 V applied at Pin 1 and Pin 5 of the 5-pole connector for the EKM? If necessary, repair wire to fuse.

- Is ground applied at Pin 4 of the 5-pole connector for the EKM? If necessary, repair ground connection.

- Check data link RXD from the 5-pole connector of the EKM Pin 2 to diagnostic socket Pin 15 and repair if necessary.

- Check data link TXD from the 5-pole connector of the E~ Pin 3 to diagnostic socket Pin 20 and repair if necessary.

- Disconnect all control units which are connected to the RxD and TxD data link (see electrical troubleshooting manual, schematics section 0670.5 diagnostic link). Check RxD and TxD wire for a short to plus or ground. Repair wire if necessary.

- If RXD and TxD wires are OK: Only connect the EKM to the RxD and TxD link. Is diagnosis now possible with EKM?

- NO: Renew EKM

- YES: A control unit which is connected to the RxD and the TxD data link is defective. Determine defective control unit by connecting all control units one after the other and checking each time whether diagnosis is possible with the EKM and the control unit.