Connection elements for heating control relay N 14
30 - terminal 30, continuous current; 31 - terminal 31, housing (–); 50 - terminal 50, voltage when the starter is pressed; LA - terminal of the control lamp of heating; 15 - terminal 15, voltage with the ignition on; G1-G5 = connection for glow plugs 1-5
1. Connect a voltmeter between terminal 30 (A) heating control relay plug and housing. The meter should show battery voltage (about 12 V).
2. Otherwise, check for an open in the red wire coming from the connector block (Х12/3) to the heating control relay.
3. Turn the ignition key to warm up and connect the voltmeter to chip 1 (terminal 15) 6-pin plug and housing. Set value: battery voltage (about 12 V). If there is no voltage, then check for an open in the black / red wire from fuse 23 (unprotected side) to the plug, chip 1.
4. Connect a voltmeter to chip 1 (+, terminal 15) and chip 4 (–, terminal 31). Set value: battery voltage (about 12 V). Otherwise, check for a break in the brown wire from chip 4 to the case.