DTC Troubleshooting: 5
LKAS Control Unit DTC 5:
 Lost Communication with EPS Control Unit
NOTE: Information marked with an asterisk ( *1 ) applies to LHD model, an asterisk ( *2 ) applies to RHD model.
  1. Turn the ignition switch to LOCK (0), then turn it to ON (II), and wait for 20 seconds or more.
  1. Watch the LKAS indicator.
Does the LKAS indicator come on?
YES -
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time.■
Is DTC 5 indicated?
YES -
Go to Step 5 .
NO -
Troubleshoot the indicated DTC(s).■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the EPS control unit connector D (28P).
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between EPS control unit connector D (28P) No. 20 terminal and body ground.
Is there battery voltage?
YES -
Repair short to power in the wire between the EPS control unit and LKAS control unit.■
NO -
Go to Step 9 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the EPS control unit D connector (28P).
  1. Disconnect the LKAS control unit 26P connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between LKAS control unit 26P connector No. 21 terminal and body ground.
Is there battery voltage?
YES -
Repair short to power in the wire between the EPS control unit and LKAS control unit.■
NO -
Go to Step 14 .
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the EPS control unit connector D (28P).
  1. Check for continuity between LKAS control unit 26P connector No. 8 and No. 21 terminals individually.
Is there continuity?
YES -
Repair short to body ground in the wire between the EPS control unit and LKAS control unit.■
NO -
Go to Step 17 .
  1. Check for continuity between LKAS control unit 26P connector No. 21 terminal and EPS control unit connector D (28P) No. 19 terminal.
Is there continuity?
YES -
Go to Step 18 .
NO -
Repair an open in the wire between the LKAS control unit and the EPS control unit.■
  1. Check for continuity between LKAS control unit 26P connector No. 8 terminal and EPS control unit connector D (28P) No. 20 terminal.
Is there continuity?
YES -
Go to Step 19 .
NO -
Repair an open in the wire between the LKAS control unit and the EPS control unit.■
Are any DTCs indicated?
YES -
Troubleshoot the EPS control unit DTC(s).■
NO -
Check for loose terminals in the EPS control unit connectors, and repair if necessary. If all connections are OK, replace the EPS control unit. ■