F-CAN Circuit Troubleshooting
  1. Check for continuity between ECM/PCM connector terminal A37 and body ground.
Is there continuity?
YES -
Repair short in the wire between the ECM/PCM terminals A37 and the gauge control module, the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the EPS control unit, the SRS unit, the navigation unit (with navigation system), or the DLC.■
NO -
Go to Step 36 .
  1. Reconnect all connectors.
  1. Connect the HDS to the DLC.
  1. Disconnect the gauge control module 32P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the gauge control module. ■
NO -
Go to Step 40 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the gauge control module 32P connector.
  1. Disconnect the VSA modulator-control unit 47P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the VSA modulator-control unit. ■
NO -
Go to Step 44 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the VSA modulator-control unit 47P connector.
  1. Disconnect the yaw rate-lateral acceleration sensor 4P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the yaw rate-lateral acceleration sensor. ■
NO -
Go to Step 48 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect the yaw rate-lateral acceleration sensor 4P connector.
  1. Disconnect EPS control unit connector D (28P).
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the EPS control unit. ■
NO -
Go to Step 52 .
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect EPS control unit connector D (28P).
  1. Disconnect SRS unit connector A (39P).
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the SRS unit. ■
NO -
  • With navigation system: Go to Step 56 .
  • Without navigation system: Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■
  1. Turn the ignition switch to LOCK (0).
  1. Reconnect SRS unit connector A (28P).
  1. Disconnect the navigation unit 32P connector.
  1. Turn the ignition switch to ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the navigation unit. ■
NO -
Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM, then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM. ■