Preparation for Test 1. All fuses ok, 2. Connect the Hand-Held Tester (HHT) to X11/4, according to diagram, see section 0. The diagnostic trouble codes (DTC's) can only be read out and erased using the Hand-Held Tester (HHT). Model 210 Combination control module (N10-1) Model 170 Combination control module (N10-3) Note regarding Diagnostic Trouble Codes (DTC's): Current diagnostic trouble codes are highlighted in black on the display. Additional detailed fault information based on fault type is displayed with nearly all diagnostic codes (DTC's) such as: > Resistance too great < Resistance too low - Short circuit to ground (GND) + Short circuit to positive (POS) -//- Open circuit With some fault codes, additional information as well as fault frequency can be read out. Fault frequency Faults are noted by frequency of occurrence, i.e.: 4 periodic faults, 4 occurances. CAUTION! Model 210 Erasing the Combination Control Module (N10-1) DTC memory, will also erase the DTC memory for the Convenience Feature (CF) and Mirror, steering column adjustment, heated mirrors (MSC). Model 170 Erasing the Combination Control Module (N10-1) DTC memory, will also erase the DTC memory for the Convenience Feature (CF) and Retractable Hard Top (RHT).

DTC	Possible cause	Test step/Remedy 1)
	Combination control module (N10-1 or N10-3).	-
	Circuit 30E, voltage < 9 V	-
	Circuit 30E, voltage > 15 V	-
	Circuit 15R voltage supply missing at circuit 15.	23 2.0, 3.0
	Circuit 49 travel direction, has no voltage at circuit 15.	23 26.0
	CAN data line communication with PSE interrupted.	D. M., Body and Accessories, Vol. 2, 5.3 > 23 > 9.0, 10.0
	CAN data line LOW or combination control module (N10-1 or N10-3).	D. M., Body and Accessories, Vol. 2, 5.3 > 23 > 9.0, 10.0
	CAN data line HIGH or combination control module (N10-1 or N10-3).	D. M., Body and Accessories, Vol. 2, 5.3 > 23 > 9.0, 10.0
	Rear window defroster switch >25 s, +	23 22.0
	Non-USA vehicles only, continue to next test step.
	Dome lamp control wire + from combination control module (N10-1 or N10-3) or N10-1 or N10-3.	23 18.0
	Entrance/exit lamp wiring + or combination control module (N10-1)	23 17.0

1) Observe Preparation for Test, see 22.