DTC B1504: Lost Communication with Steering SW: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical/Combination Meter/Data List.
5. Check the values by referring to the table below.
   COMBINATION METER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Multi Switch (Up)	Multi-information switch (Steering pad switch assembly) up switch/OFF or ON	OFF: Multi-information switch (Steering pad switch assembly) up switch not pressed	-
   		ON: Multi-information switch (Steering pad switch assembly) up switch pressed	-
   Multi Switch (Down)	Multi-information switch (Steering pad switch assembly) down switch/OFF or ON	OFF: Multi-information switch (Steering pad switch assembly) down switch not pressed	-
   		ON: Multi-information switch (Steering pad switch assembly) down switch pressed	-
   Multi Switch (Menu)	Multi-information switch (Steering pad switch assembly) menu switch/OFF or ON	OFF: Multi-information switch (Steering pad switch assembly) menu switch not pressed	-
   		ON: Multi-information switch (Steering pad switch assembly) menu switch pressed	-
   Multi Switch (Enter)	Multi-information switch (Steering pad switch assembly) enter switch/OFF or ON	OFF: Multi-information switch (Steering pad switch assembly) enter switch not pressed	-
   		ON: Multi-information switch (Steering pad switch assembly) enter switch pressed	-

   OK

   Multi-information switch (steering pad switch assembly) condition displayed on the Techstream changes with the actual switch operation.

NG → See step   2 

OK → See step   5 

1. Check the spiral cable. Refer to INSPECTION .

NG → See step   6 

OK: Go to next step 

1. Disconnect the F4 and z33 connectors.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   z33-2 (IG) - Body ground	Power switch off	Below 1 V
   	Power switch on (IG)	11 to 14 V

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   z33-7 (DISP) - F4-38 (MSFM)	Always	Below 1 Ω
   F4-38 (MSFM) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the multi-information switch (steering pad switch assembly) with a new or a known good one. Refer to REMOVAL .

   OK

   The operation of the combination meter assembly returns to normal.

NG → See step   5 

OK → END