ZW central warning light
|  | Terminal connection diagram
|  | Test steps
Terminal connection diagram Test steps Replace ZW relay by a new one, or after removing the relay, measure the resistance directly between the winding contacts 85 and 86. RTarget = 285-310 Ω. Open S2 plug connection. For steps 1-4, bring one test probe of the ohmmeter into contact with the vehicle ground. Measure resistance at contact 51 of cable 2. RTarget = 285-310 Ω. If R = RTarget, continue with 4. S3 socket connection: Measure resistance at supply cable to winding start of the ZW relay (pin contact 86). RTarget = 285-310 Ω. S3: Measure resistance at supply cable to winding end of the ZW relay (pin contact 85) and ground point. RTarget = 0 Ω. If the central warning light burns in neither case, exchange light bulb. Measure resistance between + and – cable ZW. With light bulb: RTarget = approx. 160 Ω Without light bulb: RTarget = ∞ Ω. Check resistance of + and – cable ZW to vehicle ground. RTarget = ∞ Ω. S3: Check resistance at ground cable of the ZW relay (pin contact 87). RTarget = 0 Ω.
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