Test K: The Rear Electronic Module (REM) Does Not Respond To The Diagnostic Tool

PINPOINT TEST K: THE REAR ELECTRONIC MODULE (REM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL

K1-K3:

K3-K4:

K4-K5:

K6-K7:

Normal Operation
The REM communicates with the diagnostic tool through the standard corporate protocol (SCP) communications network circuits 4-EG12 (GY/WH) and 5-EG12 (BU/OG). If one of the SCP communications network circuits become shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 4-EG12 (GY/WH) and 5-EG12 (BU/OG) between the interior auxiliary junction box (AJB) C283b, interior AJB C283d or interior AJB C223 and the data link connector (DLC) C251.

The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is either an open in circuits 4-EG12 (GY/WH) and 5-EG12 (BU/OG), damage to the DLC C251, damage to the REM 420b, or a problem in the interior AJB C283b, interior AJB C283d or joint connector No. 4 C223.

Possible Causes
- SCP data plus circuit 4-EG12 (GY/WH) open
- SCP data minus circuit 5-EG12 (BU/OG) open
- joint connector No. 4 C223
- interior AJB C283b
- interior AJB C283d
- REM C420b
- REM