Reducing Agent Heater Control Module -J891-, Checking: Notes

General Description 

The Reducing Agent Heater Control Module -J891- controls the reducing agent heaters.

The Reducing Agent Heater Control Module -J891- contains the following components:

• Reducing Agent Heater Control Module -J891-
• Reducing Agent Line Heater (Heating Circuit 2) -Z104-

The Reducing Agent Heater Control Module -J891- components cannot be serviced separately, and must be serviced as a unit.

Special Tools And Workshop Equipment Required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.

Test Requirements 

• Fuses OK.
• Battery voltage OK.
• Switch OFF all electrical and electronic accessories.
• Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
• Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
• Observe all safety precautions: SAFETY PRECAUTIONS .
• View clean working conditions: CLEAN WORKING CONDITIONS .
• For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS .